Restatement of Previously Issued Financial Statements - Statement of Equity (Details) - USD ($) $ in Thousands	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total Shareholders’ Equity	$ 533,136	$ 484,370	$ 424,452	$ 379,640
Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total Shareholders’ Equity	498,527	453,908	393,846	343,127
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total Shareholders’ Equity	529,639	481,216	420,052	375,913
As Reported | Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total Shareholders’ Equity	495,030	450,754	389,446	339,400
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total Shareholders’ Equity	3,497	3,154	4,400	3,727
Correction | Retained Earnings [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total Shareholders’ Equity	$ 3,497	$ 3,154	$ 4,400	$ 3,727