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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended
	Jan. 25, 2023	Jan. 31, 2022	Jan. 26, 2022	Nov. 30, 2019	Dec. 31, 2022	Dec. 31, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements					$ 30,601
Forfeiture rate, Board of Directors					0.00%
Forfeiture rate, non-Board of Directors					7.30%
Unrecognized compensation cost is expected to be recognized over a weighted-average period					2 years 1 month 6 days
Subsequent Event [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares available for future grants	500,000
2017 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of additional shares available for future grants			800,000
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
Weighted-average exercise price					$ 83.62
Stock Options [Member] \| Share-based Compensation Award Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate					25.00%
Restricted Stock Units (RSUs) [Member] \| Vest on the Third or Fourth Anniversary [Member] \| Attraction and Retention RSU Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average exercise price					$ 96.30
Shares issued					44,000
Restricted Stock Units (RSUs) [Member] \| Vest on Fourth Anniversary [Member] \| Restricted Stock Unit Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average exercise price					$ 83.64
Shares issued					68,000
2019 Authorization [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program authorized amount				$ 500,000	$ 26,742
Repurchase period in years				3 years
Stock repurchase program, number of shares authorized to be repurchased					233,000
2022 Authorization [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program authorized amount		$ 800,000
Repurchase period in years		2 years
2022 Authorization [Member] \| Subsequent Event [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program authorized amount						$ 26,369
Stock repurchase program, number of shares authorized to be repurchased						274,000
2017 Authorization [Member] \| 2017 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grants					2,197,000		2,938,000