Senior Leverage Ratio and Total Leverage Ratio Requirements and Actual Amounts (Detail)	Aug. 31, 2013
Covenant Requirement | Maximum
Line of Credit Facility [Line Items]
Maximum Senior Leverage Ratio	4.00
Maximum Total Leverage Ratio	4.75
Covenant Requirement | Minimum
Line of Credit Facility [Line Items]
Minimum Fixed Charge Coverage Ratio	1.25
Actual | Maximum
Line of Credit Facility [Line Items]
Maximum Senior Leverage Ratio	3.12
Maximum Total Leverage Ratio	3.12
Actual | Minimum
Line of Credit Facility [Line Items]
Minimum Fixed Charge Coverage Ratio	1.42