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Capital Stock
6 Months Ended
Feb. 28, 2013
Stockholders' Equity Note [Abstract]  
Capital stock
NOTE 13. CAPITAL STOCK

On December 6, 2012, the Company amended the stockholder rights plan (the "Rights Agreement") dated as of July 30, 2011. As a result of the amendment, the rights to purchase Series B Junior Participating Preferred Stock of the Company pursuant to the Rights Agreement expired at 5:00 p.m. (Dallas, Texas time) on December 6, 2012 (the "Final Expiration Date"), and the Rights Agreement effectively terminated as of such time.