Stock Plans (Schedule of Stock Option Plans) (Details) - Stock Options [Member] - USD ($)	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Number of Shares:
Outstanding at October 31, 2015 (in shares)	1,090,531
Granted (in shares)	393,728
Exercised (in shares)	378,871
Forfeited or expired (in shares)	0
Outstanding at October 31, 2016 (in shares)	1,105,388	1,090,531
Vested and exercisable at October 31, 2016 (in shares)	468,031
Weighted-Average Exercise Price Per Share:
Outstanding at October 31, 2015 (in usd per share)	$ 79.85
Granted (in usd per share)	133.14
Exercised (in usd per share)	53.85
Forfeited or expired (in usd per share)	0.00
Outstanding at October 31, 2016 (in usd per share)	107.74	$ 79.85
Vested and exercisable at October 31, 2016 (in usd per share)	$ 74.75
Outstanding at October 31, 2016, Weighted Average Remaining Contractual Term (in years)	6 years 7 months 28 days
Vested and exercisable at October 31, 2016, Weighted Average Remaining Contractual Term (in years)	4 years 5 months
Vested and exercisable at October 31, 2016, Aggregate Intrinsic Value	$ 47,408,122
2006 Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted	$ 43.91	48.53
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
2007 LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of options granted	$ 37.24	$ 48.70
2007 LTIP [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
2007 LTIP [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years