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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Schedule of Effective Tax Rate Reconciliation [Line Items]    
Accrued employee benefit plan costs $ 21,423 $ 18,162
Stock based compensation 7,162 6,451
Net operating loss and tax credit carryforwards 2,895 45,640
Other 2,896 8,673
Gross deferred tax assets 34,376 78,926
Less valuation allowance   5,821
Net deferred tax assets 34,376 73,105
Depreciation and amortization (108,929) (189,763)
Gross deferred tax liabilities (108,929) (189,763)
Net deferred tax liabilities $ (74,553) $ (116,658)