Gain on Disposition of Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Gain Loss On Disposition Of Assets [Abstract]
Amortized gains on sale/leaseback transactions	$ 23.4	$ 17.7	$ 3.7
Reversal of accrued liability		$ 3.0
Gain related to sale of asset			$ 4.0

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

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

Name:	us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration