Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Net Periodic Pension and Other Postretirement Benefit Cost

Net periodic pension and other postretirement benefit cost for the plans included the following:

	Three months ended June 30,
	Pension				Other Postretirement
	2021		2020		2021		2020
Service cost	$	2,020	$	2,170	$	50	$	64
Interest cost *	1,560		1,933		94		140
Expected return on plan assets *	(2,761)		(2,232)		—		—
Amortization:
Prior service cost	(46)		(47)		(91)		(23)
Net actuarial loss *	2,730		2,386		—		—
Curtailment gain *	(220)		—		—		—
Prior service cost write-off *	526		—		—		—
Net benefit cost	$	3,809	$	4,210	$	53	$	181

	Nine months ended June 30,
	Pension				Other Postretirement
	2021		2020		2021		2020
Service cost	$	6,216	$	6,510	$	150	$	192
Interest cost *	4,654		5,799		282		420
Expected return on plan assets *	(8,286)		(6,696)		—		—
Amortization:
Prior service cost	(104)		(141)		(273)		(69)
Net actuarial loss *	8,774		7,159		—		—
Curtailment gain *	(220)		—		—		—
Prior service cost write-off *	526		—		—		—
Net benefit cost	$	11,560	$	12,631	$	159	$	543
* Non-service components of pension and postretirement expense are included in other income (deductions), net.

Contributions Made and Anticipated for the Current Fiscal Year

Contributions made and anticipated for fiscal year 2021 are as follows:

Contributions	Pension		Other Postretirement
Contributions during the nine months ended June 30, 2021:
Principal retirement plan	$	15,000	$	—
Supplemental retirement plan	607		—
Other postretirement plan	—		436
Additional contributions expected in fiscal 2021:
Supplemental retirement plan	$	298	$	—
Other postretirement plan	—		395