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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 180,747	$ 149,848	$ 54,525
Foreign currency translation adjustments	(2,598)	2,561	1,915
Gain on cash flow commodity hedge	0	0	325
Postretirement benefit adjustment, net of tax	(83)	(13)	(151)
Comprehensive income	$ 178,066	$ 152,396	$ 56,614

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