Restatement of Previously Issued Financial Statements - Equity Statement (Details) - USD ($) $ in Thousands	May 31, 2017	Feb. 28, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	$ 538,709	$ 533,136
Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	506,166	$ 498,527
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	536,390
As Reported | Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	503,847
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	2,319
Correction | Retained Earnings
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total shareholders’ equity	$ 2,319