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Stockholders' Equity (Summary of Activity for PSUs) (Details) - Performance Restricted Stock Units [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	106	62
Granted, Number of units		44
Forfeited, Number of units	(1)	(1)
Number of units, Ending balance	105	105
Weighted-Average Grant Date Fair Value, Beginning balance	$ 167.31	$ 146.47
Granted, Weighted-Average Grant Date Fair Value		196.63
Forfeited Weighted-Average Grant Date Fair Value	173.87	171.6
Weighted-Average Grant Date Fair Value, Ending balance	$ 167.25	$ 167.25

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
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-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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- Definition

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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- Definition

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.

+ References

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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