Goodwill and Intangible Assets - Additional Information (Detail) - May. 31, 2015 - USD ($) $ in Millions	Total	Total
Disclosure Goodwill And Intangible Assets Additional Information [Abstract]
Changes in carrying value of goodwill	$ 0.0	$ 0.0

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Name:	us-gaap_GoodwillPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration