Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 410,818	$ 402,960	$ 382,100	$ 347,043	$ 438,677	$ 379,872	$ 315,193	$ 275,836	$ 1,542,921	$ 1,409,578	$ 1,233,159
Gross margin	226,894	225,083	216,938	197,229	241,073	223,214	189,656	169,346
Net income	$ 59,777	$ 65,424	$ 54,605	$ 42,011	$ 67,686	$ 66,694	$ 52,111	$ 38,338	$ 221,817	$ 224,829	$ 222,364
Earnings per share:
Basic	$ 0.93	$ 1.02	$ 0.85	$ 0.65	$ 1.06	$ 1.04	$ 0.81	$ 0.59	$ 3.45	$ 3.49	$ 3.29
Diluted	$ 0.92	$ 1.01	$ 0.84	$ 0.65	$ 1.04	$ 1.03	$ 0.80	$ 0.58	$ 3.42	$ 3.45	$ 3.25