Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments		$ 4,490
Defined Benefit Plan, Service Cost	$ 2	40	$ 6	$ 203
Defined Benefit Plan, Interest Cost	29	35	86	177
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	(40)	(1,035)	(202)
Defined Benefit Plan, Amortization of Gains (Losses)	(161)	(106)	(484)	(540)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	(4,296)	0	(4,296)
Defined Benefit Plan, Net Periodic Benefit Cost	$ (130)	$ (4,367)	$ (1,427)	$ (4,658)