Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Oct. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 12,105	$ 2,093
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	12,105
Cash payments	4,899
Employee related restructuring liabilities	12,885		$ 5,679
2016 Restructuring Plans | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			9,600
Cash payments			3,900
Employee related restructuring liabilities			$ 5,700
Minimum | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	15,000
Maximum | Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 16,000