Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Jan. 31, 2015	Oct. 31, 2014	Apr. 30, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Severance and restructuring costs	$ 9,092	$ 2,319		$ 1,273	$ 1,278	$ 11,411	$ 2,551	$ 1,126
Other income on legal settlement.	$ 1,608
Pre-tax loss on pension settlement			$ (1,572)
Income tax provision including discrete tax benefit			$ 1,786			$ 2,486		$ 1,700
Pre-tax gain on property insurance settlement.				$ 1,005