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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($)
Mar. 31, 2022
Mar. 31, 2021
Apr. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reduction to retained earnings $ 1,443,705,000 $ 1,383,561,000  
Accounts receivable, net of allowance for credit losses 144,029,000 108,409,000  
Unbilled work in progress, net of allowance for credit losses 104,751,000 118,115,000  
Other assets 57,646,000 50,747,000  
Retained earnings $ 922,223,000 $ 600,096,000  
Cumulative Effect, Period Of Adoption, Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reduction to retained earnings     $ (924,000)
Deferred income taxes, net     242,000
Retained earnings     $ (682,000)