Long-Term Debt - 2012 Credit Facility - Additional Information (Detail) - Term Loan And Revolving Credit Facility - USD ($) $ in Millions	May. 31, 2013	Dec. 20, 2012
Debt Instrument [Line Items]
Senior Secured debt	$ 405.0	$ 50.0
Maturity date of revolving credit facility	May 31, 2013

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant