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INCOME TAXES - Components of Net Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 31, 2021
Deferred income tax assets:    
Accrued expenses $ 80,344 $ 78,005
Deferred compensation 56,361 52,191
Stock-based compensation 9,783 5,724
Pension and postretirement benefits 30,797 32,881
Net operating loss carryforwards 44,118 98,471
Extended disability benefits 2,426 2,838
Interest rate swaps 75 9,955
Federal tax credits 0 12,582
State tax credits 24,268 27,243
Operating lease liabilities 82,799 86,046
Other 0 3,378
Total gross deferred income tax assets 330,971 409,314
Less: Valuation allowance (8,715) (6,165)
Total net deferred income tax assets 322,256 403,149
Deferred income tax liabilities:    
Unbilled receivables (209,753) (245,809)
Intangible assets (56,657) (69,519)
Debt issuance costs (1,435) (1,488)
Property and equipment (198,940) (336,321)
Operating lease right-of-use assets (59,401) (62,442)
Internally developed software 0 (20,309)
Other (3,345) 0
Total deferred income tax liabilities (529,531) (735,888)
Net deferred income tax liabilities $ (207,275) $ (332,739)