Pension and Post-retirement Benefits (Tables)

6 Months Ended

Mar. 31, 2015

Pension and Post-retirement Benefits

Schedule of components of net periodic pension and postretirement benefit cost

	Three Months Ended March 31,											Six Months Ended March 31,
	Pension Benefits						Other Benefits					Pension Benefits						Other Benefits
	2014			2015			2014			2015		2014			2015			2014			2015
Service cost	$	992		$	974		$	66		$	85	$	1,985		$	1,949		$	133		$	169
Interest cost	2,845			2,582			1,144			1,096		5,700			5,223			2,289			2,192
Expected return	(3,566		)	(3,483		)	—			—		(7,144		)	(7,046		)	—			—
Amortizations	1,355			1,355			(224		)	608		2,709			2,716			(449		)	1,217
Net periodic benefit cost	$	1,626		$	1,428		$	986		$	1,789	$	3,250		$	2,842		$	1,973		$	3,578