Senior Leverage Ratio and Total Leverage Ratio Requirements and Actual Amounts (Detail)	May 31, 2013 BasisPoint
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	3.21
Maximum Total Leverage Ratio	3.21
Actual | Minimum
Line of Credit Facility [Line Items]
Minimum Fixed Charge Coverage Ratio	1.50