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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended		12 Months Ended
	Nov. 20, 2025	Jan. 31, 2024	Jun. 30, 2026	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements			$ 36,789	$ 36,789
Forfeiture rate, Board of Directors			0.00%	0.00%
Forfeiture rate, non-Board of Directors			7.20%	7.20%
Unrecognized compensation cost is expected to be recognized over a weighted-average period				2 years
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			$ 0	$ 391.53
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] \| Share-based Compensation Award Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period, in years				4 years
Vesting rate				25.00%
Restricted Stock Units (RSUs) [Member] \| On or After November 14, 2023 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period, in years				3 years
Vesting rate				33.30%
Performance Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Discount for dividends					0.00%
Market condition awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance period (in years)				3 years
Performance based criteria plan payout percentage, target				100.00%
Market condition awards [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based criteria plan payout percentage				200.00%		150.00%
Market condition awards [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based criteria plan payout percentage				0.00%		0.00%
Performance Condition Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance period (in years)				3 years
Performance Condition Award [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based criteria plan payout percentage				200.00%
Performance Condition Award [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based criteria plan payout percentage				0.00%
2026 Authorization [Member]
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Stock repurchase program authorized amount			$ 513,886	$ 513,886
Repurchase period in years	3 years
Stock repurchase program, number of shares authorized to be repurchased			1,453,000	1,453,000
New stock repurchase program authorized amount	$ 1,800,000
2024 Authorization [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock repurchase program authorized amount		$ 600,000	$ 39,145	$ 39,145	$ 124,276
Repurchase period in years		3 years
Stock repurchase program, number of shares authorized to be repurchased			153,000	153,000	680,000