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Supplementary Data - Selected Unaudited Quarterly Financial Data (Details) - 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]
Revenue	$ 633,719	$ 615,204	$ 605,005	$ 568,604	$ 587,159	$ 555,805	$ 557,204	$ 542,043	$ 2,422,532	$ 2,242,211	$ 2,057,472
Gross margin	491,508	475,527	473,375	439,160	447,315	426,334	432,232	417,410	1,879,570	1,723,291	1,600,587
Income before provision for income taxes	82,752	85,231	97,223	64,342	55,918	65,193	83,884	76,615	$ 329,548	$ 281,610	$ 272,142
Net income	$ 72,697	$ 64,718	$ 69,376	$ 60,035	$ 49,762	$ 55,387	$ 55,596	$ 65,189
Net income per share
Basic (in USD per share)	$ 0.48	$ 0.43	$ 0.46	$ 0.39	$ 0.32	$ 0.36	$ 0.36	$ 0.42	$ 1.76	$ 1.46	$ 1.67
Diluted (in USD per share)	$ 0.47	$ 0.42	$ 0.45	$ 0.39	$ 0.31	$ 0.35	$ 0.35	$ 0.41	$ 1.73	$ 1.43	$ 1.64

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