Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Sep. 09, 2015	Oct. 31, 2015	Jul. 31, 2015	[1],[2]	Jul. 31, 2014	[1],[2]	Jul. 31, 2013	Sep. 16, 2015
Subsequent Event [Line Items]
Restructuring Charge			$ (354)		$ 3,483		$ 3,519
Scenario, Forecast
Subsequent Event [Line Items]
Restructuring Charge		$ 3,000
Subsequent Event
Subsequent Event [Line Items]
Dividend declaration date	Sep. 09, 2015
Dividend declared	$ 0.10
Dividend payable date	Oct. 10, 2015
Dividend record date	Sep. 25, 2015
Restructuring Charge expected to incur								$ 6,000

[1] Activity in fiscal year 2014 pertains to both the Fiscal Year 2014 Restructuring Plan and the 2013 Restructuring Plan. In fiscal year 2014, the restructuring charges of $2.9 million relate to the Fiscal Year 2014 Restructuring Plan, while restructuring charges of $0.6 million and cash payments of ($2.5) million relate to the Fiscal Year 2013 Restructuring Plan.

[2] Activity in fiscal year 2015 pertains to both the Fiscal Year 2014 Restructuring Plan and the 2013 Restructuring Plan. In fiscal year 2015, the restructuring adjustments of ($0.3) million and cash payments of ($2.4) million relate to the Fiscal Year 2014 Restructuring Plan, while restructuring adjustments of ($0.1) million and cash payments of ($0.5) million relate to the Fiscal Year 2013 Restructuring Plan.