Capital Leases (Narrative) (Details)	Aug. 31, 2012
Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate on capital lease	3.25%
Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate on capital lease	6.50%

The percentage points added to the reference rate to compute the variable rate on the lessee's capital lease.

No definition available.

Name:	us-gaap_CapitalLeasesOfLesseeContingentRentalsBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant