Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of stock repurchase plan authorized.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount remaining of a stock repurchase plan authorized.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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As of the balance sheet date, the forfeiture rate used to calculate the aggregate unrecognized cost of equity-based awards made to employees and members of the board of directors under equity-based compensation awards that have yet to vest. This is the rate applied to shares granted to members of our Board of Directors.

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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 29, 2020	Nov. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements			$ 10,913
Forfeiture rate, Board of Directors			0.00%
Forfeiture rate, non-Board of Directors			7.00%
Unrecognized compensation cost is expected to be recognized over a weighted-average period			2 years
2017 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares available for future grants	1,000,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested contractual term, in years			10 years
Vesting period, in years			4 years
Exercise prices of stock options outstanding			$ 68.21	$ 62.00
Stock Options [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate			25.00%
2017 Authorization [Member] \| 2017 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grants			2,714,000
2019 Authorization [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program authorized amount			$ 45,860	$ 13,346	$ 110,311
Repurchase period in years		3 years
Stock repurchase program, number of shares authorized to be repurchased			404,000	124,000	1,102,000
Stock repurchase program, number of shares authorized to be repurchased in-transit			110,000
Stock repurchase program authorized in-transit amount			$ 12,516
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices of stock options outstanding			$ 127.84
Maximum [Member] \| 2019 Authorization [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program authorized amount		$ 500,000
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise prices of stock options outstanding			$ 33.64