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Income Taxes - Components of Net Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Mar. 31, 2022
Deferred income tax assets:    
Accrued expenses $ 146,945 $ 80,344
Deferred compensation 47,931 56,361
Stock-based compensation 11,628 9,783
Pension and postretirement benefits 28,585 30,797
Net operating loss and other carryforwards 16,984 44,118
Research and development expenditures and indirect effects 599,381 0
State tax credits 11,516 24,268
Operating lease liabilities 69,604 82,799
Other 9,100 2,501
Total gross deferred income tax assets 941,674 330,971
Less: Valuation allowance (11,788) (8,715)
Total net deferred income tax assets 929,886 322,256
Deferred income tax liabilities:    
Unbilled receivables (177,321) (209,753)
Intangible assets (88,858) (56,657)
Property and equipment (34,905) (198,940)
Operating lease right-of-use assets (48,939) (59,401)
Other (6,083) (4,780)
Total deferred income tax liabilities (356,106) (529,531)
Net deferred income tax asset $ 573,780  
Net deferred income tax (liability)   $ (207,275)