Components of Periodic Benefit Costs (Tables)

6 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic benefit cost (income) for pension benefits and other benefits for the three and six months ended March 31, 2018 and 2017 includes the following components:

	For the Three Months Ended March 31,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	1,780		$	1,905		$	61	$	59	$	93		$	118
Interest cost	2,129			2,111			111		107		205			186
Expected return on plan assets	(4,815		)	(6,202		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(34		)	(34		)
Net loss	707			2,750			103		113		69			81
Net periodic cost (income)	$	(199	)	$	564		$	275	$	279	$	333		$	351

	For the Six Months Ended March 31,
	Pension				RIM		Post-retirement
	2018		2017		2018	2017	2018		2017
	(In thousands)
Service cost	3,560		3,811		122	119	186		236
Interest cost	4,258		4,222		222	215	410		371
Expected return on plan assets	(9,630	)	(12,405	)	—	—	—		—
Amortization:
Prior service cost	—		—		—	—	(68	)	(68	)
Net loss	1,414		5,499		206	227	138		163
Net periodic cost (income)	(398	)	1,127		550	561	666		702