Stock Plans (Schedule of Stock Option Plans) (Details)	12 Months Ended
	Oct. 31, 2018 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	1,055,266
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 159.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	7 years 1 month 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $	$ 104,596,614
Stock Options [Member]
Number of Shares:
Outstanding at October 31, 2015 (in shares) | shares	1,064,466
Granted (in shares) | shares	256,639
Exercised (in shares) | shares	234,107
Forfeited or expired (in shares) | shares	0
Outstanding at October 31, 2016 (in shares) | shares	1,086,998
Vested and exercisable at October 31, 2016 (in shares) | shares	379,113.00
Weighted-Average Exercise Price Per Share:
Outstanding at October 31, 2015 (in usd per share) | $ / shares	$ 129.33
Granted (in usd per share) | $ / shares	229.49
Exercised (in usd per share) | $ / shares	95.26
Forfeited or expired (in usd per share) | $ / shares	0.00
Outstanding at October 31, 2016 (in usd per share) | $ / shares	160.31
Vested and exercisable at October 31, 2016 (in usd per share) | $ / shares	$ 127.11
Outstanding at October 31, 2016, Weighted Average Remaining Contractual Term (in years)	7 years 2 months 3 days
Vested and exercisable at October 31, 2016, Weighted Average Remaining Contractual Term (in years)	5 years 8 months 16 days
Vested and exercisable at October 31, 2016, Aggregate Intrinsic Value | $	$ 49,741,332