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Debt - Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Long-term debt gross	$ 976,039	$ 1,113,224
Unamortized debt issuance expense	6,421	8,493
Long-term debt, net of unamortized issuance costs	969,618	1,104,731
Senior Unsecured 5.00% Due 2028
Debt Instrument [Line Items]
Long-term debt	600,000	600,000
Unamortized debt issuance expense	5,106	6,306
Amended Credit Facility, due 2022 | Secured Debt | 2017 Revolver borrowings
Debt Instrument [Line Items]
Incremental term loan commitment	376,039	513,224
Unamortized debt issuance expense	$ 1,315	$ 2,187

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Amount of short-term and long-term debt and lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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