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Schedule of Senior Unsecured Notes Redemption Prices (Detail) - 4.500% Senior Unsecured Notes Due 2026 [Member] | 6 Months Ended
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Sep. 30, 2017
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. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 + Details
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