Restatement of Previously Issued Financial Statements - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income	$ 9,786	$ 10,159	$ 21,848	$ 32,348
Comprehensive Income	15,098	10,350	26,149	35,004
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income	8,329	10,023	21,569	31,086
Comprehensive Income	13,641	10,214	25,870	33,742
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income	1,457	136	279	1,262
Comprehensive Income	$ 1,457	$ 136	$ 279	$ 1,262