Significant Accounting Policies - Revenues in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Accounting Policies [Abstract]
Product sales, net									$ 1,330,238	$ 1,560,229	$ 1,810,329
Royalty and licensing income									15,702	11,225	9,215
Total	$ 335,900	$ 336,134	$ 333,052	$ 340,854	$ 401,388	$ 378,215	$ 396,941	$ 394,910	$ 1,345,940	$ 1,571,454	$ 1,819,544