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Schedule of Senior Unsecured Notes Redemption Prices (Detail) - 4.500% Senior Unsecured Notes Due 2026 [Member]
12 Months Ended
Mar. 31, 2018
2021 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption price, percentage 102.25%
2022 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption price, percentage 101.50%
2023 [Member]  
Debt Instrument Redemption [Line Items]  
Redemption price, percentage 100.75%
2024 and Thereafter [Member]  
Debt Instrument Redemption [Line Items]  
Redemption price, percentage 100.00%