Effect of Accounting Change in Deferred Income Taxes Balance Sheet Classification (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Nov. 30, 2015	Jul. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-current deferred tax asset	$ 12,350	$ 4,600	$ 9,904
Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Non-current deferred tax asset			9,904,000
Net deferred tax assets			9,904,000
Previously Reported | Accounting Standards Update 2015-17
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current deferred tax asset			7,987,000
Non-current deferred tax asset			5,308,000
Non-current deferred tax liability			(3,391,000)
Net deferred tax assets			$ 9,904,000