Employee Benefit Plans (Details) (USD $)	12 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Postemployment Benefits [Abstract]
Costs recognized for postemployement benefit plan	$ 10,042,744	$ 10,437,080	$ 10,492,458

The amount of the cost recognized during the period for defined contribution plans.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration