Condensed Consolidated Balance Sheet (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Aug. 31, 2012	May 31, 2012
Condensed Consolidated Balance Sheet [Abstract]
Allowance for student receivables	$ 821	$ 759
Accumulated amortization of course development	$ 1,799	$ 1,715
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	28,059,307	28,057,891
Common stock, shares outstanding	25,575,540	25,574,124
Treasury stock, shares	2,483,767	2,483,767