Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Foreign Exchange Contracts (Details)

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Fair Value Measurements - Foreign Exchange Contracts (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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Maximum term of forward contracts     30 days  
Net foreign currency loss $ 254 $ 276 $ 423 $ 1,625
Foreign Exchange Forward Contracts [Member]
       
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreign exchange contract forwards, assets     87 8
Foreign exchange contract forwards, liabilities     32 196
Gain (loss) on realized on foreign currency related to forward contracts     $ 3 $ 554