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Income Taxes (Tables)
12 Months Ended
Mar. 31, 2024
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,
 202420232022
Current
U.S. Federal$229,234 $354,569 $232,844 
State and local116,751 86,947 26,333 
Foreign2,635 9,120 8,486 
Total current348,620 450,636 267,663 
Deferred
U.S. Federal(94,321)(300,494)(146,581)
State and local(5,990)(50,318)11,781 
Foreign(695)(3,090)4,603 
Total deferred(101,006)(353,902)(130,197)
Total$247,614 $96,734 $137,466 
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,
 202420232022
Income tax expense computed at U.S. federal statutory rate$179,197 $77,269 $126,981 
Increases (reductions) resulting from:
State and local income taxes, net of federal tax85,486 32,599 28,762 
Foreign income taxes, net of federal tax(7,932)4,765 9,243 
Non-deductible expenses, including non-deductible penalties4,867 34,825 859 
Excess tax benefits from stock-based compensation(10,091)(5,247)(4,227)
Research and development and other federal credits(31,289)(33,159)(34,080)
Executive compensation -162(m)6,307 4,295 3,614 
Foreign-Derived Intangible Income (FDII)(13,971)(15,869)(9,115)
Changes in uncertain tax positions (including indirect effects)37,592 (6,498)16,938 
Other(2,552)3,754 (1,509)
Income tax expense from operations$247,614 $96,734 $137,466 
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,
 20242023
Current income tax receivable
$47,158 $23,633 
Long term income tax receivable
$152,474 $167,821 
Current income tax payable
$11,331 $14,523 
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,
 20242023
Deferred income tax assets:
Accrued expenses$102,618 $146,945 
Deferred compensation54,314 47,931 
Stock-based compensation11,107 11,628 
Pension and postretirement benefits34,895 28,585 
Net operating loss and other carryforwards9,621 16,984 
Research and development expenditures and indirect effects248,147 599,381 
State tax credits108 11,516 
Operating lease liabilities63,781 69,604 
Other10,261 9,100 
Total gross deferred income tax assets534,852 941,674 
Less: Valuation allowance(8,078)(11,788)
Total net deferred income tax assets526,774 929,886 
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 
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,
 202420232022
Beginning of year$547,885 $78,519 $62,742 
Increases in prior year position40,704 — 2,620 
Increases in current year position13,352 470,881 13,530 
Decreases in prior year position(473,848)(1,328)(373)
Settlements with taxing authorities(23,696)— — 
Lapse of statute of limitations(234)(187)— 
End of year$104,163 $547,885 $78,519