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Employee Service Share Based Compensation Nonvested Profit UnitAwards Total Compensation Cost Not Yet Recognized Period For Recognition

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Number of shares authorized to be issued under the Incentive Employee Stock Purchase Plan

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Number of shares authorized and issued under the Incentive Plan Stock Alternative.

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Maximum Amount Purchase Of Non-Voting Common Stock Permitted Per Six Months

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Percent Of Market Price For Non-Voting Common Stock Purchases By Eligible Employees

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Share Based Compensation Arrangement By Share Based Payment Award Cumulative Profit Unit Grants Gross

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Share Based Compensation Arrangement By Share Based Payment Award Profit Unit Grants In Period Gross

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Number of shares authorized to be issued under the employee stock purchase plan.

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Non-Voting stock reserved for issuance under Nonqualified Employee Stock Purchase Plan

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The number of options exercised under a non-qualified Stock Option Income Deferral Plan, used by key employees to defer recognition of income upon exercise of non-qualified stock options.

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Number of shares authorized and issued under the Qualified and Nonqualified Employee Stock Purchase Plans.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The cash inflow from the additional capital contribution to the entity.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Stock Based Compensation Plans (Employee Stock Purchase Plan and Other Incentive Plans Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Based Compensation Expense Net Total			$ 239,286,000	$ 91,913,000	$ 88,055,000
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted-average grant date fair value ($ per share)			$ 46.36
Granted, shares			1,694,000
Stock Based Compensation Expense Net Total			$ 140,700,000
Vesting period			5 years
Phantom Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Employee Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-Voting stock reserved for issuance under the 2013 Qualified Employee Stock Purchase Plan			500,000
Stock Issued Reserved For Issuance Shares Employee Stock Purchase Plans, Non-Qualified			100,000
Cumulative Non-Voting Common Stock issued under the Qualified and Nonqualified Employee Stock Purchase Plans			600,000
Proceeds from issuance of Non-voting Common stock			$ 3,000,000.0	3,200,000	3,200,000
Maximum amount purchase of Non-Voting Common Stock permitted per six months			$ 12,500
Percent of market price for Non-Voting Common Stock purchases by eligible employees			90.00%
Stock Based Compensation Expense Net Total			$ 525,000	355,000	793,000
Employee Stock Purchase Plans [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of Non-voting Common stock	$ 1,600,000
Employee Stock Purchase Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-Voting Common stock reserved for issuance under the Employee Stock Purchase incentive Plan			900,000
Non-voting Common stock issued under the Employee Stock Purchase Incentive Plan			800,000
Proceeds from issuance of Non-voting Common stock			$ 4,000,000.0	4,600,000	4,900,000
Percent of market price for Non-Voting Common Stock purchases by eligible employees			90.00%
Stock Based Compensation Expense Net Total			$ 1,096,000	512,000	877,000
Employee Stock Purchase Incentive Plans [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of Non-voting Common stock	$ 2,000,000.0
Atlanta Capital Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Based Compensation Expense Net Total			$ 1,604,000	$ 2,280,000	2,969,000
Atlanta Capital Long Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Profit interest units issued during the year			0	0
Compensation cost related to awards issued under the plan, not yet recognized			$ 800,000
Weighted-average period over which compensation cost related to awards issued under subsidiary plan is expected to be recognized (in years)			1 year
Cumulative profit units granted			323,016
Vesting period			5 years
Atlanta Capital Phantom Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to awards issued under the plan, not yet recognized			$ 5,600,000
Atlanta Capital Phantom Incentive Plan [Member] \| Phantom Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted-average grant date fair value ($ per share)			$ 150.42
Granted, shares			23,938,000
Parametric Long Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Based Compensation Expense Net Total		$ 1,600,000	$ 0	$ 3,461,000	$ 3,177,000
Parametric Phantom Incentive Plan 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to awards issued under the plan, not yet recognized			$ 100,000
Weighted-average period over which compensation cost related to awards issued under subsidiary plan is expected to be recognized (in years)			1 year 8 months 12 days
Parametric Phantom Incentive Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost related to awards issued under the plan, not yet recognized			$ 100,000
Weighted-average period over which compensation cost related to awards issued under subsidiary plan is expected to be recognized (in years)			3 years
Stock Option Income Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares exercised and placed in trust with the Company			200,000