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Gain on Disposition of Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Gain Loss On Disposition Of Assets [Abstract]
Amortized gains on sale/leaseback transactions	$ 23.4	$ 23.4	$ 17.7
Reversal of accrued liability			$ 3.0

X

- Definition

Disposal Group, Including Discontinued Operation, Gain (Loss) on Reversal of Accrued Liabilities

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The portion of the deferred gain that was recognized in the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754

+ Details

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