Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions	Jul. 31, 2015	Jul. 31, 2014
Intangible Assets by Major Class [Line Items]
Indefinite-lived Trade names	$ 7.6
Finite-lived intangible assets	41.9
Trade names
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets	$ 0.1	$ 0.4

Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

Name:	us-gaap_IndefiniteLivedTradeNames
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant