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Significant Accounting Matters (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2016 | 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
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  | $ 5,000 |  |  | $ 7,400 | $ 3,000 |  |  | $ 3,000 | $ 12,400 | $ 6,000 | $ 9,000 |
Cash and cash equivalents | $ 225,800 | 23,087 |  |  |  | 225,800 |  |  |  | 23,087 | 225,800 | 12,295 | $ 70,027
Inventory | 301,609 | 289,122 |  |  |  | 301,609 |  |  |  | 289,122 | 301,609 |  |
Property and equipment, net | 130,465 | 134,935 |  |  |  | 130,465 |  |  |  | $ 134,935 | $ 130,465 |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  | 44.00% | 44.00% |  |
Operating income |  |  |  |  |  |  |  |  |  | $ 164,332 | $ 130,615 | 161,719 |
Net Income |  | $ 35,696 | $ 57,612 | $ 28,355 | $ 19,026 | $ 9,588 | $ 46,778 | $ 24,452 | $ 20,410 | $ 140,689 | $ 101,228 | $ 131,164 |
Diluted earnings per share (in dollars per share) |  | $ 1.30 | $ 2.07 | $ 1.00 | $ 0.68 | $ 0.34 | $ 1.63 | $ 0.84 | $ 0.70 | $ 5.04 | $ 3.52 | $ 4.52 |
Revision to product liability estimates |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | $ 2,200 |  |  |
Net Income |  |  |  |  |  |  |  |  |  | $ 1,400 |  |  |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.05 |  |  |
Venezuela |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Charge from re-measurement of monetary assets and liabilities due to an exchange rate change | 9,570 |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 9,160 |  |  |  |  |  |  |  |  |  |  |  |
Net investment in Venezuelan operations |  | $ 149 |  |  |  |  |  |  |  | $ 149 |  |  |
Venezuela | Before Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment in Venezuelan operations |  | 18,882 |  |  |  |  |  |  |  | 18,882 |  |  |
Venezuela | Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment in Venezuelan operations |  | (18,733) |  |  |  |  |  |  |  | $ (18,733) |  |  |
Venezuela | Net sales revenue | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of revenue to total revenue |  |  |  |  |  |  |  |  |  | 0.10% |  |  |
SG&A | Venezuela |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 10 |  |  |  |  |  |  |  | $ 10 |  |  |
Other net assets, principally working capital other than inventory |  | (164) |  |  |  |  |  |  |  | (164) |  |  |
Property and equipment, net |  | 3 |  |  |  |  |  |  |  | 3 |  |  |
SG&A | Venezuela | Before Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 1,302 |  |  |  |  |  |  |  | 1,302 |  |  |
Other net assets, principally working capital other than inventory |  | 8,120 |  |  |  |  |  |  |  | 8,120 |  |  |
Property and equipment, net |  | 82 |  |  |  |  |  |  |  | 82 |  |  |
SG&A | Venezuela | Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | (1,292) |  |  |  |  |  |  |  | (1,292) |  |  |
Other net assets, principally working capital other than inventory |  | (8,284) |  |  |  |  |  |  |  | (8,284) |  |  |
Property and equipment, net |  | (79) |  |  |  |  |  |  |  | (79) |  |  |
Cost of goods sold | Venezuela |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  | 300 |  |  |  |  |  |  |  | 300 |  |  |
Cost of goods sold | Venezuela | Before Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  | 9,378 |  |  |  |  |  |  |  | 9,378 |  |  |
Cost of goods sold | Venezuela | Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory |  | $ (9,078) |  |  |  |  |  |  |  | $ (9,078) |  |  |

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