Stockholders' Equity (Summary of Activity for RSUs) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2025	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of units, Beginning balance	303	318
Granted, Number of units	101	113
Released, Number of units	(51)	(77)
Forfeited, Number of units	(3)	(4)
Number of units, Ending balance	350	350
Weighted-Average Grant Date Fair Value, Beginning balance	$ 122.07	$ 118.19
Granted, Weighted-Average Grant Date Fair Value	193.09	191.08
Released, Weighted-Average Grant Date Fair Value	137.63	125.32
Forfeited Weighted-Average Grant Date Fair Value	144.37	126.88
Weighted-Average Grant Date Fair Value, Ending balance	$ 140.11	$ 140.11

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Share based compensation arrangement by share based payment award equity instruments other than options released in period weighted average grant date fair value.

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