Stock Plans - Stock Option Plans (Details)	12 Months Ended
	Oct. 31, 2020 USD ($) $ / shares shares
Number of Shares
Vested and expected to vest at end of period (in shares) | shares	1,060,738
Vested and exercisable at end of period (in shares) | shares	430,926
Weighted- Average Exercise Price Per Share
Vested and expected to vest at end of period (in dollars per share) | $ / shares	$ 211.04
Vested and exercisable at end of period (in dollars per share) | $ / shares	$ 167.09
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Vested and expected to vest at end of period, Weighted-Average Remaining Contractual Term (in years)	6 years 4 months 9 days
Vested and exercisable at end of period, Weighted-Average Remaining Contractual Term (in years)	5 years 3 days
Vested and expected to vest at end of period, Aggregate Intrinsic Value | $	$ 114,567,509
Vested and exercisable at end of period, Aggregate Intrinsic Value | $	$ 65,485,571
Stock Options
Number of Shares
Outstanding, beginning balance (in shares) | shares	1,024,752
Granted (in shares) | shares	212,046
Exercised (in shares) | shares	(105,045)
Forfeited or expired (in shares) | shares	(28,246)
Outstanding, ending balance (in shares) | shares	1,103,507
Weighted- Average Exercise Price Per Share
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 186.24
Granted (in dollars per share) | $ / shares	304.54
Exercised (in dollars per share) | $ / shares	128.43
Forfeited or expired (in dollars per share) | $ / shares	223.28
Outstanding, ending balance (in dollars per share) | $ / shares	$ 213.53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, ending balance, Weighted Average Remaining Contractual Term (in years)	6 years 5 months 8 days