Letters of Credit (Detail) (USD $)	Mar. 01, 2013	Mar. 01, 2012
Line of Credit Facility [Line Items]
Letter of credit outstanding	$ 1,900,000	$ 2,000,000

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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