Changes in Accumulated Other Comprehensive (Loss) Income (Detail) $ in Thousands	9 Months Ended
	Apr. 30, 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	300
Amount reclassed to earnings	500
Income tax provision	(100)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(3,769)
Unrealized Gain (Loss) on Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(400)
Amount reclassed to earnings	500
Income tax provision	(100)
Unrealized Gains (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
Income tax provision	(100)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(3,000)
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	200
Income tax provision	100
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	$ (800)