Stockholders' Equity (Tables)

3 Months Ended

Dec. 31, 2023

Stockholders' Equity Note [Abstract]

Summary of accumulated other comprehensive income (loss)

			Unrealized
			Gains (Losses)
			on Available-
	Currency		for-Sale		Gains (Losses)		Pension
	Translation		Securities		on Derivative asset		Liability
	Adjustments		Net of tax		Net of tax		Adjustments		Total
Balance at September 30, 2022	$	(165,694)	$	(10,909)	$	93,020	$	(333)	$	(83,916)
Other comprehensive income (loss) before reclassifications		77,414		1,555		(57,127)		—		21,842
Balance at December 31, 2022	$	(88,280)	$	(9,354)	$	35,893	$	(333)	$	(62,074)

			Unrealized
			Gains (Losses)
			on Available-
	Currency		for-Sale		Gains (Losses)		Pension
	Translation		Securities		on Derivative asset		Liability
	Adjustments		Net of tax		Net of tax		Adjustments			Total
Balance at September 30, 2023	$	(88,448)	$	(5,135)	$	31,487	$	(330)	$	(62,426)
Other comprehensive income (loss) before reclassifications		46,494		2,524		(13,368)		(35)		35,615
Amounts reclassified from accumulated other comprehensive income (loss)		—		—		—		27		27
Balance at December 31, 2023	$	(41,954)	$	(2,611)	$	18,119	$	(338)	$	(26,784)