Changes in Accumulated Other Comprehensive Income ( Loss) (Detail) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	$ 9,148,000	$ 2,300,000	$ 11,500,000
Pre-tax change before reclass to earnings	(2,100,000)	7,500,000	(9,600,000)
Amount reclassed to earnings	200,000	300,000	200,000
Income tax (provision) benefit	600,000	(1,000,000)	200,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	7,805,000	9,148,000	2,300,000
Unrealized Gains (Losses) on Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(100,000)	0
Pre-tax change before reclass to earnings		(100,000)	100,000
Amount reclassed to earnings	100,000	(100,000)
Income tax (provision) benefit		100,000	(100,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance		(100,000)	0
Unrealized Gains (Losses) on Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	(2,300,000)	(4,700,000)	(3,100,000)
Pre-tax change before reclass to earnings	(1,900,000)	3,300,000	(2,700,000)
Amount reclassed to earnings	100,000	400,000	200,000
Income tax (provision) benefit	500,000	(1,300,000)	900,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	(3,600,000)	(2,300,000)	(4,700,000)
Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning balance	11,500,000	7,000,000	14,600,000
Pre-tax change before reclass to earnings	(200,000)	4,300,000	(7,000,000)
Income tax (provision) benefit	100,000	200,000	(600,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending balance	$ 11,400,000	$ 11,500,000	$ 7,000,000