Stock Plans (Schedule of Stock Option Plans) (Details)	12 Months Ended
	Oct. 31, 2017 USD ($) $ / shares shares
Weighted-Average Exercise Price Per Share:
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares	1,045,509
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 128.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	6 years 11 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $	$ 116,337,456
Stock Options [Member]
Number of Shares:
Outstanding at October 31, 2015 (in shares) | shares	1,105,388
Granted (in shares) | shares	194,416
Exercised (in shares) | shares	200,108
Forfeited or expired (in shares) | shares	35,230
Outstanding at October 31, 2016 (in shares) | shares	1,064,466
Vested and exercisable at October 31, 2016 (in shares) | shares	439,137
Weighted-Average Exercise Price Per Share:
Outstanding at October 31, 2015 (in usd per share) | $ / shares	$ 107.74
Granted (in usd per share) | $ / shares	175.31
Exercised (in usd per share) | $ / shares	53.42
Forfeited or expired (in usd per share) | $ / shares	136.90
Outstanding at October 31, 2016 (in usd per share) | $ / shares	129.33
Vested and exercisable at October 31, 2016 (in usd per share) | $ / shares	$ 106.07
Outstanding at October 31, 2016, Weighted Average Remaining Contractual Term (in years)	6 years 11 months 13 days
Vested and exercisable at October 31, 2016, Weighted Average Remaining Contractual Term (in years)	5 years 5 months 9 days
Vested and exercisable at October 31, 2016, Aggregate Intrinsic Value | $	$ 58,929,605