Components of Net Deferred Tax Assets (Detail) - USD ($) $ in Millions	Jul. 31, 2017	Jul. 31, 2016
Assets
Compensation	$ 8.3	$ 10.0
Accruals and reserves	8.7	5.5
Comprehensive income	1.2	2.0
Net operating losses and credit carryforwards	17.5	17.0
Goodwill and intangibles	3.3
Other	0.8	0.9
Deferred tax assets	39.8	35.4
Valuation allowance	(28.3)	(11.4)
Total deferred tax assets	11.5	24.0
Liabilities
Depreciation related	(6.3)	(8.0)
Goodwill and intangibles		(5.3)
Total deferred tax liabilities	(6.3)	(13.3)
Net deferred tax assets	$ 5.2	$ 10.7