Changes in Accumulated Other Comprehensive (Loss) Income (Detail) (USD $)	9 Months Ended
	Apr. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	$ 7,805,000
Pre-tax change before reclassification to earnings	(11,000,000)
Income tax benefit	(100,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(3,264,000)
Unrealized Losses on Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(3,600,000)
Income tax benefit	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(3,600,000)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	11,400,000
Pre-tax change before reclassification to earnings	(10,900,000)
Income tax benefit	(100,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	400,000
Unrealized Gains (Losses) on Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax change before reclassification to earnings	(100,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	$ (100,000)