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Fair Value of Senior Notes (Parenthetical) (Detail) - 4.500% Senior Unsecured Notes Due 2026 [Member] | 6 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Aug. 02, 2016
Fair Value Of Financial Instruments [Line Items] |  |
Debt instrument, interest rate | 4.50% | 4.50%
Debt instrument, maturity year | 2026 |

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- Definition Debt instrument maturity year. + References No definition available. + Details
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Balance Type: | na
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- Definition Fair value of financial instruments. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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