Components of Net Deferred Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Assets
Compensation	$ 10.1	$ 11.6
Accruals and reserves	4.9	5.1
Comprehensive income	1.4
Net operating losses and credit carryforwards	16.6	8.9
Other	3.4	3.3
Deferred tax assets	36.4	28.9
Valuation allowance	(6.6)	(6.3)
Total deferred tax assets	29.8	22.6
Liabilities
Depreciation related	(7.9)	(5.8)
Goodwill and intangibles	(7.8)	(4.3)
Comprehensive income		(0.2)
Total deferred tax liabilities	(15.7)	(10.3)
Net deferred taxes	$ 14.1	$ 12.3