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Income Taxes - Components of Net Deferred Income Taxes (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Deferred income tax assets:    
Accrued expenses $ 102,618 $ 146,945
Deferred compensation 54,314 47,931
Stock-based compensation 11,107 11,628
Pension and postretirement benefits 34,895 28,585
Net operating loss and other carryforwards 9,621 16,984
Research and development expenditures and indirect effects 248,147 599,381
State tax credits 108 11,516
Operating lease liabilities 63,781 69,604
Other 10,261 9,100
Total gross deferred income tax assets 534,852 941,674
Less: Valuation allowance (8,078) (11,788)
Total net deferred income tax assets 526,774 929,886
Deferred income tax liabilities:    
Unbilled receivables (131,919) (177,321)
Intangible assets (93,207) (88,858)
Property and equipment (25,725) (34,905)
Operating lease right-of-use assets (45,022) (48,939)
Other (3,730) (6,083)
Total deferred income tax liabilities (299,603) (356,106)
Net deferred income tax asset $ 227,171 $ 573,780