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Schedule of Senior Unsecured Notes Redemption Prices (Detail) - 4.500% Senior Unsecured Notes Due 2026 [Member]	6 Months Ended
	Sep. 30, 2019
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%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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