Long-Term Debt - Summary of Long-term Debt (Detail) (Revolving Credit Facility [Member], USD $) In Thousands, unless otherwise specified	May 31, 2013	Feb. 28, 2013
Revolving Credit Facility [Member]
Credit Facilities [Line Items]
Revolving credit facility	$ 45,000	$ 57,500

Amount borrowed under the credit facility as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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