Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended			24 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Severance and restructuring costs	$ 6,411	$ 1,714	$ 1,633	$ 1,017	$ 9,092	$ 2,319		$ 10,775	$ 11,411	$ 2,551	$ 16,621
Other expense related to reversal of indemnification asset resulting from effective settlement of tax exam		2,722
Discrete tax benefit related to effective settlement of tax exam		$ 1,651	1,136
Other income on legal settlement.			800		$ 1,608
Favorable adjustment to unrecognized tax benefits			$ 1,192					2,682
Additional tax benefit relating to retroactive reinstatement of research and development credit				2,025			$ 1,786		$ 2,486
Additional tax benefit related to dividends paid from foreign earnings tax credit				$ 6,184				$ 6,154
Pre-tax loss on pension settlement							$ (1,572)