Pension and Post-retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2016

Pension and Post-retirement Benefits

Schedule of components of net periodic pension and postretirement benefit cost

	Three Months Ended June 30,								Nine Months Ended June 30,
	Pension Benefits				Other Benefits				Pension Benefits				Other Benefits
	2015		2016		2015		2016		2015		2016		2015		2016
Service cost	$	975	$	1,020	$	84	$	58	$	2,924	$	3,060	$	253	$	174
Interest cost		2,787		2,549		1,097		1,149		8,010		8,262		3,289		3,447
Expected return		(3,761)		(2,978)		—		—		(10,807)		(9,753)		—		—
Amortizations		1,381		2,320		608		706		4,097		7,086		1,825		2,118
Net periodic benefit cost	$	1,382	$	2,911	$	1,789	$	1,913	$	4,224	$	8,655	$	5,367	$	5,739