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Business Segment Information (Details Textual)
0 Months Ended 4 Months Ended 21 Months Ended
Jan. 30, 2011
segment
division
May 31, 2011
segment
division
Feb. 28, 2013
segment
division
Segment Reporting [Abstract]      
Number of business divisions 4 3 2
Number of aggregated reportable segments   1  
Number of reportable operating segments 4 3 3