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Income Taxes - Components of Net Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Deferred income tax assets:    
Accrued expenses $ 53,322 $ 85,459
Accrued compensation 28,326 41,421
Stock-based compensation 7,785 15,326
Pension and postretirement benefits 34,449 48,672
Property and equipment 0 3,885
Net operating loss/Capital loss carryforwards 3,362 246
Deferred rent and tenant allowance 20,931 25,167
Extended disability benefits 5,963 8,860
State tax credits 9,822 4,829
Other 1,184 1,988
Total gross deferred income tax assets 165,144 235,853
Less: Valuation allowance (1,373) 0
Total net deferred income tax assets 163,771 235,853
Deferred income tax liabilities:    
Unbilled receivables (105,498) (141,357)
Intangible assets (57,020) (78,871)
Debt issuance costs (3,264) (4,709)
Property and equipment (398) 0
Interest rate swaps (2,076) 0
Other 0 (91)
Total deferred income tax liabilities (168,256) (225,028)
Net deferred income tax liabilities $ (4,485)  
Net deferred income tax asset   $ 10,825