Restatement of Previously Issued Financial Statements - Equity Statement (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Feb. 28, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	$ 549,089	$ 533,136
Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	511,530	$ 498,527
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	545,313
As Reported | Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	507,754
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	3,776
Correction | Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	$ 3,776