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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Accrued employee benefit plan costs $ 18,241 $ 19,705
Stock based compensation 2,940 6,780
Net operating loss and tax credit carryforwards 14,693 6,177
Other 5,587 5,548
Gross deferred tax assets 41,461 38,210
Less valuation allowance (2,327) (4,705)
Net deferred tax assets 39,134 33,505
Basis difference in partnership (17,322) (8,375)
Depreciation and amortization (27,355) (25,130)
Gross deferred tax liabilities (44,677) $ (33,505)
Net deferred tax assets (liabilities) $ (5,543)