Retirement Plans (Tables)

3 Months Ended

Aug. 31, 2016

Retirement Plan (Tables) [Abstract]

Schedule of Retirement Plan Costs

	2016		2015
Defined benefit pension plans	$	58	$	53
Defined contribution plans		119		102
Postretirement healthcare plans		19		21
	$	196	$	176

Schedule of Net Periodic Benefit Cost

	Pension Plans				Postretirement Healthcare Plans
	2016		2015		2016		2015
Service cost	$	180	$	166	$	9	$	10
Interest cost		293		295		10		11
Expected return on plan assets		(386)		(377)		-		-
Amortization of prior service credit and other		(29)		(31)		-		-
	$	58	$	53	$	19	$	21

Schedule of Pension Plans Contributions

	2016		2015
Required	$	-	$	6
Voluntary		250		159
	$	250	$	165