Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended				3 Months Ended
	Oct. 31, 2013	Oct. 31, 2013 Unrealized Gains (Losses) on Foreign Currency Forward Contracts	Oct. 31, 2013 Unrealized Gain (Loss) on Pension Plan	Jul. 31, 2013 Unrealized Gain (Loss) on Pension Plan	Oct. 31, 2013 Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income,Net of Tax, Beginning balance	$ 9,148,000	$ (100,000)	$ (2,300,000)	$ (2,300,000)	$ 11,500,000
Pre-tax change before reclass to earnings	900,000	(100,000)			1,000,000
Amount reclassed to earnings (Note 9)	100,000	100,000
Income tax benefit (provision)	100,000				100,000
Accumulated Other Comprehensive Income, Net of Tax, Ending balance	$ 10,223,000	$ (100,000)	$ (2,300,000)	$ (2,300,000)	$ 12,600,000