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Summary of Significant Accounting Policies - ASC 606 Opening Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2017 | Mar. 01, 2018
Assets |  |  |  |  |  |  |  |  |  |  |  |
Inventories | $ 124,847 |  |  |  | $ 110,761 |  |  |  | $ 124,847 | $ 110,761 |  | $ 118,425
Liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Contract liabilities | 56,928 |  |  |  | 22,698 |  |  |  | 56,928 | 22,698 |  | 29,646
Retained earnings | 560,224 |  |  |  | 526,018 |  |  |  | 560,224 | 526,018 |  | 526,734
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Net | 202,548 | $ 239,516 | $ 222,787 | $ 262,236 | 200,660 | $ 208,158 | $ 196,329 | $ 205,283 | 927,087 | 810,430 | $ 863,538 |
Cost of goods sold |  |  |  |  |  |  |  |  | 728,466 | 650,121 | 658,206 |
Gross profit | 43,257 | $ 49,755 | $ 46,904 | $ 58,705 | 38,010 | $ 31,117 | $ 43,800 | $ 47,382 | 198,621 | 160,309 | 205,332 |
Operating income |  |  |  |  |  |  |  |  | 76,956 | 48,248 | $ 98,908 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 119,627 |  |  |  | 110,761 |  |  |  | 119,627 | 110,761 |  |
Liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Contract liabilities | 53,444 |  |  |  | 22,698 |  |  |  | 53,444 | 22,698 |  |
Retained earnings |  |  |  |  | $ 526,018 |  |  |  |  | $ 526,018 |  |
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 923,623 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 726,022 |  |  |
Gross profit |  |  |  |  |  |  |  |  | 197,601 |  |  |
Operating income |  |  |  |  |  |  |  |  | 75,936 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 5,220 |  |  |  |  |  |  |  | 5,220 |  |  | 7,664
Liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Contract liabilities | $ 3,484 |  |  |  |  |  |  |  | 3,484 |  |  | 6,948
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ 716
Consolidated Statements of Income |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Net |  |  |  |  |  |  |  |  | 3,464 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 2,444 |  |  |
Gross profit |  |  |  |  |  |  |  |  | 1,020 |  |  |
Operating income |  |  |  |  |  |  |  |  | $ 1,020 |  |  |

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