Restructuring Charges - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		18 Months Ended
	Sep. 16, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	May. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring Charge		$ 3,147	$ (152)	$ 6,430	$ (210)
Fiscal Year 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge	$ 10,200
Restructuring charges incurred to date		$ 6,400		$ 6,400		$ 6,400
Fiscal Year 2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charge						$ 2,900
Fiscal Year 2013 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date							$ 4,100