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Restatement of Previously Issued Financial Statements - Balance Sheets and Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2015 | Feb. 28, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventories - net | $ 94,007 |  |  |  | $ 77,131 |  |  |  | $ 94,007 | $ 77,131 |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 50,262 |  |  |  | 63,482 |  |  |  | 50,262 | 63,482 |  |
Total current assets | 297,052 |  |  |  | 315,525 |  |  |  | 297,052 | 315,525 |  |
Assets | 978,354 |  |  |  | 988,201 |  |  |  | 978,354 | 988,201 | $ 925,315 |
Other accrued liabilities | 24,042 |  |  |  | 26,137 |  |  |  | 24,042 | 26,137 |  |
Customer advance payment | 1,459 |  |  |  | 0 |  |  |  | 1,459 | 0 |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 20,617 |  |  |  | 20,302 |  |  |  | 20,617 | 20,302 |  |
Total Current Liabilities | 136,770 |  |  |  | 149,549 |  |  |  | 136,770 | 149,549 |  |
Deferred income tax liabilities | 53,648 |  |  |  | 51,853 |  |  |  | 53,648 | 51,853 |  |
Total liabilities | 445,218 |  |  |  | 503,831 |  |  |  | 445,218 | 503,831 |  |
Retained earnings | 498,527 |  |  |  | 453,908 |  |  |  | 498,527 | 453,908 |  |
Total Shareholders’ Equity | 533,136 |  |  |  | 484,370 |  |  |  | 533,136 | 484,370 | 424,452 | $ 379,640
Total Liabilities and Shareholders’ Equity | 978,354 |  |  |  | 988,201 |  |  |  | 978,354 | 988,201 |  |
Net Income | 12,270 | $ 16,646 | $ 10,159 | $ 22,189 | 15,182 | $ 22,822 | $ 14,866 | $ 22,674 | 61,264 | 75,544 | 65,616 |
Deferred income tax expense |  |  |  |  |  |  |  |  | 1,714 | 1,960 | 16,222 |
Inventories |  |  |  |  |  |  |  |  | (13,754) | (2,052) | (3,363) |
Net change in billings related to costs and estimated earnings on uncompleted contracts |  |  |  |  |  |  |  |  | 13,592 | 7,276 | (13,823) |
Other accrued liabilities and income taxes payable |  |  |  |  |  |  |  |  | (10,211) | 9,755 | (5,865) |
Net cash provided by operating activities: |  |  |  |  |  |  |  |  | 111,176 | 143,589 | 118,157 |
As Reported |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventories - net | 123,208 |  |  |  | 102,135 |  |  |  | 123,208 | 102,135 |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 20,546 |  |  |  | 32,287 |  |  |  | 20,546 | 32,287 |  |
Total current assets | 296,537 |  |  |  | 309,334 |  |  |  | 296,537 | 309,334 |  |
Assets | 977,839 |  |  |  | 982,010 |  |  |  | 977,839 | 982,010 |  |
Other accrued liabilities | 18,390 |  |  |  | 20,406 |  |  |  | 18,390 | 20,406 |  |
Customer advance payment | 20,860 |  |  |  | 15,652 |  |  |  | 20,860 | 15,652 |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 11,948 |  |  |  | 9,237 |  |  |  | 11,948 | 9,237 |  |
Total Current Liabilities | 141,850 |  |  |  | 148,405 |  |  |  | 141,850 | 148,405 |  |
Deferred income tax liabilities | 51,550 |  |  |  | 49,960 |  |  |  | 51,550 | 49,960 |  |
Total liabilities | 448,200 |  |  |  | 500,794 |  |  |  | 448,200 | 500,794 |  |
Retained earnings | 495,030 |  |  |  | 450,754 |  |  |  | 495,030 | 450,754 |  |
Total Shareholders’ Equity | 529,639 |  |  |  | 481,216 |  |  |  | 529,639 | 481,216 | 420,052 | 375,913
Total Liabilities and Shareholders’ Equity | 977,839 |  |  |  | 982,010 |  |  |  | 977,839 | 982,010 |  |
Net Income | 11,584 | 18,251 | 10,023 | 21,063 | 16,076 | 23,547 | 17,243 | 19,924 | 60,921 | 76,790 | 64,943 |
Deferred income tax expense |  |  |  |  |  |  |  |  | 1,509 | 2,707 | 15,818 |
Inventories |  |  |  |  |  |  |  |  | (17,951) | 11,124 | (879) |
Net change in billings related to costs and estimated earnings on uncompleted contracts |  |  |  |  |  |  |  |  | 14,509 | 5,739 | (5,635) |
Other accrued liabilities and income taxes payable |  |  |  |  |  |  |  |  | (6,383) | (3,877) | (15,460) |
Net cash provided by operating activities: |  |  |  |  |  |  |  |  | 111,176 | 143,589 | 118,157 |
Correction |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Inventories - net | (29,201) |  |  |  | (25,004) |  |  |  | (29,201) | (25,004) |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 29,716 |  |  |  | 31,195 |  |  |  | 29,716 | 31,195 |  |
Total current assets | 515 |  |  |  | 6,191 |  |  |  | 515 | 6,191 |  |
Assets | 515 |  |  |  | 6,191 |  |  |  | 515 | 6,191 |  |
Other accrued liabilities | 5,652 |  |  |  | 5,731 |  |  |  | 5,652 | 5,731 |  |
Customer advance payment | (19,401) |  |  |  | (15,652) |  |  |  | (19,401) | (15,652) |  |
Billings in excess of costs and estimated earnings on uncompleted contracts | 8,669 |  |  |  | 11,065 |  |  |  | 8,669 | 11,065 |  |
Total Current Liabilities | (5,080) |  |  |  | 1,144 |  |  |  | (5,080) | 1,144 |  |
Deferred income tax liabilities | 2,098 |  |  |  | 1,893 |  |  |  | 2,098 | 1,893 |  |
Total liabilities | (2,982) |  |  |  | 3,037 |  |  |  | (2,982) | 3,037 |  |
Retained earnings | 3,497 |  |  |  | 3,154 |  |  |  | 3,497 | 3,154 |  |
Total Shareholders’ Equity | 3,497 |  |  |  | 3,154 |  |  |  | 3,497 | 3,154 | 4,400 | $ 3,727
Total Liabilities and Shareholders’ Equity | 515 |  |  |  | 6,191 |  |  |  | 515 | 6,191 |  |
Net Income | $ 686 | $ (1,605) | $ 136 | $ 1,126 | $ (894) | $ (725) | $ (2,377) | $ 2,750 | 343 | (1,246) | 673 |
Deferred income tax expense |  |  |  |  |  |  |  |  | 205 | (747) | 404 |
Inventories |  |  |  |  |  |  |  |  | 4,197 | (13,176) | (2,484) |
Net change in billings related to costs and estimated earnings on uncompleted contracts |  |  |  |  |  |  |  |  | (917) | 1,537 | (8,188) |
Other accrued liabilities and income taxes payable |  |  |  |  |  |  |  |  | (3,828) | 13,632 | 9,595 |
Net cash provided by operating activities: |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |

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