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Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($)
Dec. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]    
Finance lease obligations (see Note 1) $ 48,227,000 $ 56,336,000
Total debt 2,196,836,000 1,854,597,000
Unamortized discount and debt issuance costs (17,854,000) (21,441,000)
Less: current portion of long-term debt 29,590,000 30,472,000
Total long-term debt 2,149,392,000 1,802,684,000
2028 Notes [Member]    
Debt Instrument [Line Items]    
Principal amount of debt 400,000,000 400,000,000
2027 Notes [Member]    
Debt Instrument [Line Items]    
Principal amount of debt 600,000,000 600,000,000
2025 Notes [Member]    
Debt Instrument [Line Items]    
Principal amount of debt 700,000,000 700,000,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal amount of debt 370,000,000  
Ex-Im Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal amount of debt $ 78,609,000 $ 98,261,000