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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Aug. 24, 2011
Estimated fair values of the assets acquired and liabilities assumed        
Total cash consideration       $ 10,673
Preliminary purchase price allocation        
Accounts receivable   972   542
Rental and lease equipment 240,993   243,173 15,896
Deferred tax liability       (2,092)
Deferred revenue       (479)
Net assets acquired       13,867
Bargain purchase gain, net of deferred taxes of $2,092       $ (3,194)