Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Millions	Jul. 31, 2015	Jul. 31, 2014
Assets
Compensation	$ 8.4	$ 10.1
Accruals and reserves	5.7	4.9
Comprehensive income	1.4	1.4
Net operating losses and credit carryforwards	19.6	16.6
Other	0.6	3.4
Deferred tax assets	35.7	36.4
Valuation allowance	(10.6)	(6.6)
Total deferred tax assets	25.1	29.8
Liabilities
Depreciation related	(8.7)	(7.9)
Goodwill and intangibles	(6.5)	(7.8)
Total deferred tax liabilities	(15.2)	(15.7)
Net deferred tax assets	$ 9.9	$ 14.1