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Supplemental Financial Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Allowance for doubtful accounts
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance $ 188 $ 799 $ 1,348
Provision for doubtful accounts 1,621 397 1,502
Allowance for doubtful accounts from acquisitions 0 32 0
Charges against allowance (352) (1,040) (2,051)
Ending balance 1,457 188 799
Tax valuation allowance
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 0 36,335 42,379
Charges against allowance 0 (36,335) 0
Sale of capital assets 0 0 (6,044)
Ending balance $ 0 $ 0 $ 36,335