Changes in Accumulated Other Comprehensive (Loss) Income (Detail) $ in Thousands	6 Months Ended
	Jan. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	$ (4,506)
Pre-tax change before reclassification to earnings	(3,200)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(7,719)
Unrealized Gain on Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(400)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(400)
Unrealized Losses on Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(3,000)
Pre-tax change before reclassification to earnings	100
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(2,900)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(1,100)
Pre-tax change before reclassification to earnings	(3,300)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	$ (4,400)