Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 569,295	$ 581,243	$ 553,706	$ 550,424	$ 573,938	$ 589,438	$ 496,137	$ 407,470	$ 2,254,668	$ 2,066,982	$ 1,808,994
Gross margin	307,738	320,396	306,828	301,003	312,088	326,265	275,512	225,138
Net income	$ 86,702	$ 94,884	$ 91,235	$ 104,555	$ 79,835	$ 101,456	$ 64,523	$ 49,988	$ 377,375	$ 295,802	$ 271,843
Earnings per share:
Basic	$ 1.49	$ 1.63	$ 1.57	$ 1.81	$ 1.38	$ 1.76	$ 1.12	$ 0.87	$ 6.51	$ 5.14	$ 4.76
Diluted	$ 1.47	$ 1.61	$ 1.55	$ 1.78	$ 1.37	$ 1.74	$ 1.11	$ 0.86	$ 6.40	$ 5.08	$ 4.73