Summary of Charges Related to Accrued Restructuring Activities (Detail) - USD ($) $ in Thousands		3 Months Ended
		Oct. 31, 2016		Oct. 31, 2015
Restructuring Cost and Reserve [Line Items]
Balance at beginning period		$ 5,200		$ 600
Adjustments		30
Restructuring Charge		32		3,283
Cash payments		(2,700)		(700)
Balance at end period		2,500		3,200
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Balance at beginning period		5,200	[1]	200	[2]
Adjustments	[1]	30
Restructuring Charge	[2]			3,200
Cash payments		(2,700)	[1]	(500)	[2]
Balance at end period		$ 2,500	[1]	2,900	[2]
Facility Exit Costs
Restructuring Cost and Reserve [Line Items]
Balance at beginning period	[3]			400
Cash payments	[3]			(100)
Balance at end period	[3]			300
Other Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	[2]			100
Cash payments	[2]			$ (100)

[1] Activity during the period pertains to the 2016 Restructuring Plan.

[2] All activity during the period pertains to the 2014 Restructuring Plan. For more information on the 2014 Restructuring Plan, please refer to Note 4. Restructuring charges on Form 10-K for fiscal year 2016, as filed with the SEC on September 27, 2016.

[3] All activity during the period pertains to the 2013 Restructuring Plan. For more information on the 2013 Restructuring Plan, please refer to Note 4. Restructuring charges on Form 10-K for fiscal year 2016, as filed with the SEC on September 27, 2016.