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 $)
In Thousands, unless otherwise specified
1 Months Ended 11 Months Ended 12 Months Ended
Apr. 30, 2010
Mar. 31, 2011
Mar. 31, 2013
Mar. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]        
Obligations due to settle the CHS Transactions     $ 3,239 $ 3,528
Amortization of intangible assets 215 18,030 11,211 11,379
CHS Transactions [Member]
       
Acquired Finite-Lived Intangible Assets [Line Items]        
Obligations due to settle the CHS Transactions     $ 3,589  
Weighted average useful life of intangible assets     10 years  
CHS Transactions [Member] | Developed Technology [Member]
       
Acquired Finite-Lived Intangible Assets [Line Items]        
Estimated lives of intangible assets     20 years  
CHS Transactions [Member] | Backlog [Member]
       
Acquired Finite-Lived Intangible Assets [Line Items]        
Estimated lives of intangible assets     4 months  
CHS Transactions [Member] | Customer Relationships [Member]
       
Acquired Finite-Lived Intangible Assets [Line Items]        
Estimated lives of intangible assets     10 years  
CHS Transactions [Member] | Other [Member]
       
Acquired Finite-Lived Intangible Assets [Line Items]        
Estimated lives of intangible assets     6 years