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Income Taxes (Tables)
12 Months Ended
Mar. 31, 2023
Income Tax Disclosure [Abstract]  
Summary of Components of Income Tax Expense
The components of income tax expense were as follows: 
 Fiscal Year Ended March 31,
 202320222021
Current
U.S. Federal$354,569 $232,844 $(227,309)
State and local86,947 26,333 39,542 
Foreign9,120 8,486 9,250 
Total current450,636 267,663 (178,517)
Deferred
U.S. Federal(300,494)(146,581)245,624 
State and local(50,318)11,781 (13,626)
Foreign(3,090)4,603 — 
Total deferred(353,902)(130,197)231,998 
Total$96,734 $137,466 $53,481 
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the provision for income tax to the amount computed by applying the statutory federal income tax rate to income from continuing operations before income taxes for each of the three years ended March 31 is as follows: 
 Fiscal Year Ended March 31,
 202320222021
Income tax expense computed at U.S. federal statutory rate$77,269 $126,981 $139,112 
Increases (reductions) resulting from:
State and local income taxes, net of federal tax32,599 28,762 17,586 
Foreign income taxes, net of federal tax4,765 9,243 6,679 
Non-deductible expenses, including non-deductible penalties34,825 859 918 
Re-measurement of current year losses under CARES Act
— — (76,767)
Excess tax benefits from stock-based compensation(5,247)(4,227)(8,556)
Research and development and other federal credits(33,159)(34,080)(30,313)
Executive compensation -162(m)4,295 3,614 3,813 
Foreign-Derived Intangible Income (FDII)(15,869)(9,115)(4,536)
Changes in uncertain tax positions (including indirect effects)(6,498)16,938 6,793 
Other3,754 (1,509)(1,248)
Income tax expense from operations$96,734 $137,466 $53,481 
Schedule of Components of Income Tax Receivables and Payables
The Company has both income tax receivables and income tax payable on its consolidated balance sheet as follows:
 March 31,
 20232022
Current income tax receivable
$23,633 $47,142 
Long term income tax receivable
$167,821 $341,738 
Current income tax payable
$14,523 $34,324 
Schedule of Components of Deferred Tax Assets and Liabilities
The significant components of the Company’s deferred income tax assets and liabilities were as follows:
 March 31,
 20232022
Deferred income tax assets:
Accrued expenses$146,945 $80,344 
Deferred compensation47,931 56,361 
Stock-based compensation11,628 9,783 
Pension and postretirement benefits28,585 30,797 
Net operating loss and other carryforwards16,984 44,118 
Research and development expenditures and indirect effects599,381 — 
State tax credits11,516 24,268 
Operating lease liabilities69,604 82,799 
Other9,100 2,501 
Total gross deferred income tax assets941,674 330,971 
Less: Valuation allowance(11,788)(8,715)
Total net deferred income tax assets929,886 322,256 
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 (liability)$573,780 $(207,275)
Schedule of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of potential tax benefits for the periods presented is as follows: 
 March 31,
 202320222021
Beginning of year$78,519 $62,742 $55,221 
Increases in prior year position— 2,620 5,018 
Increases in current year position470,881 13,530 12,753 
Decreases in prior year position(1,328)(373)— 
Settlements with taxing authorities— — — 
Lapse of statute of limitations(187)— (10,250)
End of year$547,885 $78,519 $62,742