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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 145,530	$ 119,021	$ 311,975	$ 257,403
Other comprehensive income (loss):
Foreign currency translation adjustment	1,889	(386)	(1,398)	2,118
Available-for-sale securities:
Unrealized gains on securities, net of taxes of $0 and $4 for the three months ended March 31, 2025 and 2024, respectively, and $0 and $16 for the six months ended March 31, 2025 and 2024, respectively	0	20	0	69
Net change in unrealized gains on available-for-sale securities, net of tax	0	20	0	69
Total other comprehensive income (loss)	1,889	(366)	(1,398)	2,187
Comprehensive income	$ 147,419	$ 118,655	$ 310,577	$ 259,590

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