Fair Value Measurements (Tables)

6 Months Ended

Nov. 30, 2012

Fair Value Measurements [Abstract]

Assets and liabilities measured at fair value on a recurring basis

	At November 30, 2012
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Balance
Assets
Money market funds	$	53	$	—	$	—	$	53
Supplemental executive retirement plan		2,784		—		—		2,784
Total assets measured at fair value	$	2,837	$	—	$	—	$	2,837
Liabilities
Foreign exchange forward contracts		—		141		—		141
Total liabilities measured at fair value	$	—	$	141	$	—	$	141
	At May 31, 2012
	Quoted Prices in Active Markets for Identical Instruments (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Balance
Assets
Money market funds	$	2,507	$	—	$	—	$	2,507
Supplemental executive retirement plan		2,370		—		—		2,370
Foreign exchange forward contracts		—		179		—		179
Total assets measured at fair value	$	4,877	$	179	$	—	$	5,056