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Accounts Receivable, Net (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Current      
Accounts receivable–billed $ 395,509 $ 431,770  
Accounts receivable–unbilled 522,685 598,004  
Allowance for doubtful accounts (1,457) (188)  
Accounts receivable, net 916,737 1,029,586  
Long-term      
Unbilled receivables 22,877 19,779  
Total accounts receivable, net 939,614 1,049,365  
Provision for doubtful accounts $ 1,300 $ 544 $ 2,700