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Debt - Long Term Debt (Phantom) (Detail)	12 Months Ended
	Mar. 31, 2019
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Interest rate of debt instrument	3.375%
Maturity year	2038
2011 Credit Facility Due 2018
Debt Instrument [Line Items]
Maturity year	2018

X

- Definition

Debt Instrument Maturity Year

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- 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

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X

- 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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- Details

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- Details

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