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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 54,772	$ 95,173
Other comprehensive income, net of income taxes:
Net change related to employee benefit plans, net of income taxes of $(15.7) thousand and $(39.5) thousand for the three months ended December 31, 2024 and 2023, respectively	54	134
Unrealized gain on available-for-sale debt security, net of income taxes of $(91.0) thousand for the three months ended December 31, 2024	309	0
Other comprehensive income	363	134
Comprehensive income	$ 55,135	$ 95,307

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