This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907

Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional paid in capital	Retained earnings	Accumulated other comprehensive loss	Treasury Stock
Beginning Balance at May. 31, 2011	$ 405,637us-gaap_StockholdersEquity	$ 250	$ 371,380		$ (1,273)	$ 0
Beginning Balance, Shares at May. 31, 2011		24,985,657				0
Net income	(5,183)us-gaap_NetIncomeLoss			(5,183)
Exercise of stock options	2,157	2	2,155
Exercise of stock options, Shares	193,684	193,684
Tax effect of exercise of stock options	(295)		(295)
Issuance of performance shares, net	0
Issuance of performance shares, net, Shares		64,221
Purchase of common stock under Employee Stock Purchase Plan	1,202	1	1,201
Purchase of common stock under Employee Stock Purchase Plan, Shares		103,362
Shares issued pursuant to acquisition	117,926	95	117,831
Shares issued pursuant to acquisition, shares		9,479,607
Purchase of common stock for treasury	(2,104)					(2,104)
Purchase of common stock for treasury, shares	(142,305)us-gaap_TreasuryStockSharesAcquired					(142,305)
Stock-based compensation	4,052		4,103
Other comprehensive loss, net of tax	(1)				(1)
Ending Balance at May. 31, 2012	523,391us-gaap_StockholdersEquity	348	496,375	30,046	(1,274)	(2,104)
Ending Balance, Shares at May. 31, 2012		34,826,531				(142,305)
Net income	(1,211)us-gaap_NetIncomeLoss			(1,211)
Exercise of stock options	5		5
Exercise of stock options, Shares	16,835	16,835
Tax effect of exercise of stock options	(1,644)		(1,644)
Issuance of performance shares, net	1	1
Issuance of performance shares, net, Shares		93,429
Purchase of common stock under Employee Stock Purchase Plan	1,211	2	1,209
Purchase of common stock under Employee Stock Purchase Plan, Shares		123,556
Purchase of common stock for treasury, shares	0us-gaap_TreasuryStockSharesAcquired
Stock-based compensation	4,609		4,609
Other comprehensive loss, net of tax	(260)				(260)
Ending Balance at May. 31, 2013	526,102us-gaap_StockholdersEquity	351	500,554	28,835	(1,534)	(2,104)
Ending Balance, Shares at May. 31, 2013		35,060,351				(142,305)
Net income	2,666us-gaap_NetIncomeLoss			2,666
Exercise of stock options	1,085		1,085
Exercise of stock options, Shares	105,676	105,676
Tax effect of exercise of stock options	(146)		(146)
Issuance of performance shares, net	(1,357)	1
Issuance of performance shares, net, Shares		129,702
Purchase of common stock under Employee Stock Purchase Plan	2,718	1	2,717
Purchase of common stock under Employee Stock Purchase Plan, Shares		146,275
Purchase of common stock for treasury, shares	0us-gaap_TreasuryStockSharesAcquired
Stock-based compensation	5,502		5,502
Other comprehensive loss, net of tax	265				265
Ending Balance at May. 31, 2014	$ 536,835us-gaap_StockholdersEquity	$ 353	$ 508,354	$ 31,501	$ (1,269)	$ (2,104)
Ending Balance, Shares at May. 31, 2014		35,442,004				(142,305)