Fair Value Measurements (Tables)

12 Months Ended

May. 31, 2015

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Our assets and liabilities measured at fair value on a recurring basis were determined as follows:

	May 31, 2015
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Balance
Assets
Supplemental executive retirement plan:
Money market fund	$	166	$	—		$	—	$	166
Mutual funds	3,355		—			—		3,355
Foreign exchange forward contracts	—		(16		)	—		(16		)
Total assets measured at fair value	$	3,521	$	(16	)	$	—	$	3,505

	May 31, 2014
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Balance
Assets
Supplemental executive retirement plan:
Money market fund	$	323	$	—	$	—	$	323
Mutual funds	3,095		—		—		3,095
Foreign exchange forward contracts	—		9		—		9
Total assets measured at fair value	$	3,418	$	9	$	—	$	3,427