Acquisitions (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Nov. 30, 2011	Feb. 29, 2012	May 31, 2012	Aug. 24, 2011
Acquisition (Textual) [Abstract]
Deferred taxes, net						$ 2,092
Deposited into an escrow account for any post-closing adjustments	500					10,673
Acquired gross accounts receivable	972					542
Acquired gross accounts receivable not expected to be collected	430
Acquired gross accounts receivable resulting in fair value	542
Bargain purchase gain related to EMT		3,194
Acquisition-related transaction cost					55
Increased bargain purchase gain			396	396
Deferred taxes, net			241	241
Estimated fair value of customer relationships acquired			140	140
Post closing adjustments, disbursed from the escrow funds			273	273
Determination of assets acquired and other components			17	17
Revenues from acquired assets					5,232
Income before income taxes from acquired assets					$ 2,862