6.	Pension and other postretirement plans

The components of net periodic pension cost for the three and six months ended April 30, 2018 and April 30, 2017 were:

	U.S.						International
Three Months Ended	2018			2017			2018			2017
Service cost	$	3,054		$	3,184		$	528		$	625
Interest cost		3,658			3,243			424			419
Expected return on plan assets		(5,489	)		(5,265	)		(393	)		(358	)
Amortization of prior service cost (credit)		(3	)		11			(83	)		(76	)
Amortization of net actuarial loss		2,550			2,457			548			662
Total benefit cost	$	3,770		$	3,630		$	1,024		$	1,272

	U.S.						International
Six Months Ended	2018			2017			2018			2017
Service cost	$	6,875		$	6,243		$	1,038		$	1,159
Interest cost		7,159			6,454			833			768
Expected return on plan assets		(10,981	)		(10,443	)		(773	)		(643	)
Amortization of prior service cost (credit)		(11	)		23			(162	)		(147	)
Amortization of net actuarial loss		4,706			4,785			1,077			1,261
Total benefit cost	$	7,748		$	7,062		$	2,013		$	2,398

The components of other postretirement benefit cost for the three and six months ended April 30, 2018 and April 30, 2017 were:

	U.S.						International
Three Months Ended	2018			2017			2018			2017
Service cost	$	152		$	154		$	5		$	5
Interest cost		650			565			5			5
Amortization of prior service credit		(25	)		(41	)		—			—
Amortization of net actuarial (gain) loss		296			205			(5	)		(4	)
Total benefit cost	$	1,073		$	883		$	5		$	6


	U.S.						International
Six Months Ended	2018			2017			2018			2017
Service cost	$	373		$	376		$	10		$	9
Interest cost		1,278			1,152			10			10
Amortization of prior service credit		(50	)		(82	)		—			—
Amortization of net actuarial (gain) loss		545			434			(10	)		(8	)
Total benefit cost	$	2,146		$	1,880		$	10		$	11