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
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 11,090 $ 11,211 $ 11,379
CHS Transactions [Member]
      
Acquired Finite-Lived Intangible Assets [Line Items]      
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