Fair Value Measurements (Tables)

6 Months Ended

Nov. 30, 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:

	November 30, 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
SERP
Money market fund	$	35	$	—	$	—	$	35
Mutual funds	3,239		—		—		3,239
Foreign exchange forward contracts	—		12		—		12
Total assets measured at fair value	$	3,274	$	12	$	—	$	3,286
Liabilities
SERP	$	3,274	$	—	$	—	$	3,274
Total liabilities measured at fair value	$	3,274	$	—	$	—	$	3,274

	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
SERP
Money market fund	$	166	$	—	$	—	$	166
Mutual funds	3,355		—		—		3,355
Total assets measured at fair value	$	3,521	$	—	$	—	$	3,521
Liabilities
SERP	$	3,521	$	—	$	—	$	3,521
Foreign exchange forward contracts	—		16		—		16
Total liabilities measured at fair value	$	3,521	$	16	$	—	$	3,537