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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)

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