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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) | Mar. 31, 2021 | Apr. 01, 2020 | Mar. 31, 2020
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reduction to retained earnings | $ 1,383,561,000 |  | $ 984,382,000
Accounts receivable, net of allowance for credit losses | 108,409,000 | $ 80,313,000 | 80,912,000
Unbilled work in progress, net of allowance for credit losses | 118,115,000 | 39,589,000 | 39,821,000
Other assets | 50,747,000 | 38,797,000 | 38,890,000
Deferred income taxes, net |  | 6,085,000 | 5,843,000
Retained earnings | $ 600,096,000 | 376,789,000 | 377,471,000
Cumulative Effect, Period Of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reduction to retained earnings |  | (924,000) | $ (682,000)
Accounts receivable, net of allowance for credit losses |  | (599,000) |
Unbilled work in progress, net of allowance for credit losses |  | (232,000) |
Other assets |  | (93,000) |
Deferred income taxes, net |  | 242,000 |
Retained earnings |  | $ (682,000) |

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