Retirement Plans (Tables)

3 Months Ended

Aug. 31, 2015

Retirement Plan (Tables) [Abstract]

Schedule of Retirement Plan Costs

	2015		2014
Defined benefit pension plans	$	53	$	(7)
Defined contribution plans		102		94
Postretirement healthcare plans		21		20
	$	176	$	107

Schedule of Net Periodic Benefit Cost

	Pension Plans				Postretirement Healthcare Plans
	2015		2014		2015		2014
Service cost	$	166	$	164	$	10	$	10
Interest cost		295		275		11		10
Expected return on plan assets		(377)		(420)		-		-
Amortization of prior service credit		(31)		(26)		-		-
	$	53	$	(7)	$	21	$	20

Schedule of Pension Plans Contributions

	2015		2014
Required	$	6	$	82
Voluntary		159		83
	$	165	$	165