Summary of Restructuring Accrual by Expense Category and by Reportable Segment (Detail) $ in Thousands	6 Months Ended
	Jan. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Accrued restructuring, beginning balance	$ 186
Restructuring adjustments	41
Cash paid	(120)
Non-cash adjustments	5
Accrued restructuring, ending balance	112
Americas
Restructuring Cost and Reserve [Line Items]
Accrued restructuring, beginning balance	51
Restructuring adjustments	27
Cash paid	(12)
Non-cash adjustments	2
Accrued restructuring, ending balance	68
Asia
Restructuring Cost and Reserve [Line Items]
Restructuring adjustments	1
Non-cash adjustments	(1)
Europe
Restructuring Cost and Reserve [Line Items]
Accrued restructuring, beginning balance	23
Restructuring adjustments	2
Non-cash adjustments	(25)
All Other
Restructuring Cost and Reserve [Line Items]
Accrued restructuring, beginning balance	112
Restructuring adjustments	11
Cash paid	(108)
Non-cash adjustments	29
Accrued restructuring, ending balance	44
Employee Related Expenses
Restructuring Cost and Reserve [Line Items]
Accrued restructuring, beginning balance	100
Restructuring adjustments	19
Cash paid	(12)
Non-cash adjustments	5
Accrued restructuring, ending balance	112
Contractual Obligations
Restructuring Cost and Reserve [Line Items]
Accrued restructuring, beginning balance	86
Restructuring adjustments	22
Cash paid	$ (108)