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Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 509,283 | $ 489,899 | $ 437,592 | $ 372,220 | $ 446,200 | $ 462,731 | $ 400,727 | $ 379,008 | $ 1,808,994 | $ 1,688,666 | $ 1,704,021
Gross margin | 274,967 | 273,220 | 248,405 | 196,907 | 234,861 | 248,492 | 221,890 | 208,721 |  |  |
Net income | $ 75,867 | $ 84,214 | $ 70,601 | $ 41,161 | $ 49,624 | $ 69,388 | $ 49,214 | $ 42,885 | $ 271,843 | $ 211,111 | $ 246,773
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.33 | $ 1.48 | $ 1.24 | $ 0.72 | $ 0.84 | $ 1.15 | $ 0.81 | $ 0.69 | $ 4.76 | $ 3.48 | $ 3.88
Diluted | $ 1.31 | $ 1.46 | $ 1.23 | $ 0.72 | $ 0.84 | $ 1.14 | $ 0.80 | $ 0.69 | $ 4.73 | $ 3.45 | $ 3.84

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