Pension and Post-retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2017

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
	2016		2017		2016		2017		2016		2017		2016		2017
Service cost	$	1,020	$	1,571	$	58	$	87	$	3,060	$	4,712	$	174	$	261
Interest cost		2,549		2,712		1,149		1,073		8,262		7,853		3,447		3,219
Expected return		(2,978)		(3,699)		—		—		(9,753)		(10,702)		—		—
Amortizations		2,320		3,029		706		1,070		7,086		9,004		2,118		3,210
Net periodic benefit cost	$	2,911	$	3,613	$	1,913	$	2,230	$	8,655	$	10,867	$	5,739	$	6,690