Restatement of Previously Issued Financial Statements - Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2017	May 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income	$ 12,062	$ 22,189
Deferred income taxes	261	2,830
Inventories	(6,976)	1,131
Net change in billings related to costs and estimated earnings on uncompleted contracts	(4,940)	71
Other accrued liabilities and income taxes payable	(6,788)	(12,237)
Net cash (used in) provided by operating activities:	(15,804)	9,868
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income	13,240	21,063
Deferred income taxes	967	2,155
Inventories	(7,936)	(5,547)
Net change in billings related to costs and estimated earnings on uncompleted contracts	(10,725)	5,447
Other accrued liabilities and income taxes payable	(1,927)	(9,134)
Net cash (used in) provided by operating activities:	(15,804)	9,868
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net Income	(1,178)	1,126
Deferred income taxes	(706)	675
Inventories	960	6,678
Net change in billings related to costs and estimated earnings on uncompleted contracts	5,785	(5,376)
Other accrued liabilities and income taxes payable	(4,861)	(3,103)
Net cash (used in) provided by operating activities:	$ 0	$ 0