Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2021

Compensation And Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Income

The components of net periodic benefit income for our postretirement benefit plans are shown in the following table:

	Pension Benefits
	Three Months Ended September 30,						Six Months Ended September 30,
	2021			2020			2021			2020
Components of net periodic benefit income:
Service cost	$	186		$	383		$	378		$	760
Interest cost		11,698			16,100			23,521			32,186
Expected return on plan assets		(33,377	)		(34,136	)		(66,832	)		(68,241	)
Amortization of prior service credits		26			243			68			485
Amortization of net loss		9,614			7,807			19,198			15,605
Curtailment loss		—			—			16,024			—
Settlement loss		3,826			—			3,826			—
Special termination benefits		142			—			196			—
Net periodic benefit income	$	(7,885	)	$	(9,603	)	$	(3,621	)	$	(19,205	)