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Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Mar. 31, 2020
Aug. 02, 2016
Debt Instrument [Line Items]      
Revolving Credit Facility $ 245,000 $ 560,000  
Total Debt 1,260,000 1,575,000  
Less: Debt Origination Costs (7,284) (7,685)  
Long-term Debt 1,252,716 1,567,315  
4.500% Senior Unsecured Notes Due 2026 [Member]      
Debt Instrument [Line Items]      
Total Debt 350,000 350,000 $ 350,000
Term Loan [Member]      
Debt Instrument [Line Items]      
Total Debt $ 665,000 $ 665,000