Long-Term Debt - Parenthetical (Details)	0 Months Ended	12 Months Ended
	Aug. 10, 2010	May 31, 2013
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility expiration date		August 25, 2016
9.25% Senior Notes
Debt Instrument [Line Items]
Senior notes maturity date	2020	2020