Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narrative (Details)

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 01, 2015
Mar. 02, 2015
Dec. 31, 2014
Dec. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]                
Goodwill           $ 121,510,000 $ 105,232,000  
Accrued employee compensation related to acquisition           5,775,000 0  
Purchase price net of cash received           31,180,000 3,890,000 $ 0
Goodwill impairment           1,240,000    
Amortization of intangible assets           $ 12,754,000 10,775,000 $ 11,090,000
Restructuring Charges         $ 578,000      
Decrease in revenue (percent)           (54.00%)    
Intangible assets, net           $ 103,998,000 100,813,000  
CHS Transactions                
Acquired Finite-Lived Intangible Assets [Line Items]                
Weighted average useful life of intangible assets           10 years    
CHS Transactions | Developed Technology Rights                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           20 years    
CHS Transactions | Customer relationships                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           10 years    
CHS Transactions | Other Intangible Assets                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           6 years    
Industrial Process Insulators, Inc.                
Acquired Finite-Lived Intangible Assets [Line Items]                
Business acquisition, voting interest acquired (percentage) 100.00%              
Consideration to or on behalf of sellers at close $ 21,750,000              
Acquiree subcontractor period (years) 17 years              
Goodwill $ 10,204,000              
Revenue of Acquiree since acquisition date           $ 8,863,000    
Gain (loss) of Acquiree since acquisition date           (353,000)    
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized           $ 33,000    
Weighted average useful life of intangible assets           9 years    
Amount of purchase price held in escrow           $ 4,002,000    
Intangible assets, net           $ 12,301,000    
Industrial Process Insulators, Inc. | Customer relationships                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           10 years    
Intangible assets, net           $ 10,005,000    
Industrial Process Insulators, Inc. | Other Intangible Assets                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           3 years    
Intangible assets, net           $ 628,000    
Sumac                
Acquired Finite-Lived Intangible Assets [Line Items]                
Business acquisition, voting interest acquired (percentage)   75.00%            
Consideration to or on behalf of sellers at close   $ 10,956,000            
Goodwill   7,992,000            
Revenue of Acquiree since acquisition date           11,710,000    
Gain (loss) of Acquiree since acquisition date           $ 3,546,000    
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized             134,000  
Weighted average useful life of intangible assets           3 years 7 months 18 days    
Amount of purchase price held in escrow           $ 1,097,000    
Payments to acquire businesses   10,956,000            
Debt instrument, face amount   5,905,000            
Intangible assets, net           $ 2,056,000    
Sumac | Customer relationships                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           4 years    
Intangible assets, net           $ 1,959,000    
Sumac | Other Intangible Assets                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           2 years    
Intangible assets, net           $ 97,000    
Unitemp                
Acquired Finite-Lived Intangible Assets [Line Items]                
Business Acquisition, Transaction Costs     $ 34,000          
Consideration to or on behalf of sellers at close     3,890,000          
Goodwill     1,630,000          
Weighted average useful life of intangible assets           7 years 1 month    
Amount of purchase price held in escrow     287          
Purchase price net of cash received     $ 4,000,000          
Intangible asset impairment           $ 473,000    
Intangible assets, net           $ 343,000 1,238,000  
Unitemp | Developed Technology Rights                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           3 years    
Intangible assets, net           $ 55,000 104,000  
Unitemp | Customer relationships                
Acquired Finite-Lived Intangible Assets [Line Items]                
Amortization period           5 years    
Intangible assets, net           $ 0 362,000  
CHS Transactions                
Acquired Finite-Lived Intangible Assets [Line Items]                
Intangible assets, net           89,298,000 $ 99,575,000  
Canada, Dollars | Minimum [Member] | Sumac                
Acquired Finite-Lived Intangible Assets [Line Items]                
Debt instrument, maturity payment amount   0            
Canada, Dollars | Maximum [Member] | Sumac                
Acquired Finite-Lived Intangible Assets [Line Items]                
Debt instrument, maturity payment amount   $ 7,500,000            
CANADA                
Acquired Finite-Lived Intangible Assets [Line Items]                
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent       34.00%        
CANADA | CHS Transactions                
Acquired Finite-Lived Intangible Assets [Line Items]                
Goodwill           36,694,000    
Intangible assets, net           $ 25,941,000    
Unitemp                
Acquired Finite-Lived Intangible Assets [Line Items]                
Goodwill impairment (percent)           100.00%