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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Sales revenue, net | $ 384,843 | $ 431,081 | $ 393,548 | $ 354,679 | $ 387,564 | $ 420,841 | $ 344,949 | $ 325,491 | $ 1,564,151 | $ 1,478,845 | $ 1,397,535
Gross profit | 157,530 | 181,845 | 155,173 | 146,558 | 158,014 | 178,138 | 143,477 | 131,570 | 641,106 | 611,199 | 573,416
Asset impairment charges | 0 | 0 | 0 | 0 | 11,447 | 0 | 0 | 4,000 | 0 | 15,447 | 2,900
Restructuring charges | 977 | 25 | 859 | 1,725 | 692 | 1,165 | 0 | 0 | 3,586 | 1,857 | 0
Income from continuing operations | 37,714 | 54,320 | 44,017 | 38,173 | 8,378 | 58,624 | 34,572 | 27,308 | 174,224 | 128,882 | 144,310
Loss from discontinued operations | $ (448) | $ (4,850) | $ 0 | $ (381) | $ 51,703 | $ (89,060) | $ (25,639) | $ (21,440) | $ (5,679) | $ (84,436) | $ (3,621)
Earnings (loss) per share - basic |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in usd per share) | $ 1.49 | $ 2.08 | $ 1.67 | $ 1.44 | $ 0.31 | $ 2.16 | $ 1.27 | $ 1.01 | $ 6.68 | $ 4.76 | $ 5.24
Discontinued operations (in usd per share) | (0.02) | (0.19) | 0.00 | (0.01) | 1.91 | (3.28) | (0.94) | (0.79) | (0.22) | (3.12) | (0.13)
Total earnings per share - basic (in usd per share) | 1.47 | 1.90 | 1.67 | 1.42 | 2.22 | (1.12) | 0.33 | 0.22 | 6.46 | 1.64 | 5.11
Earnings (loss) per share - diluted |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in usd per share) | 1.47 | 2.06 | 1.66 | 1.43 | 0.31 | 2.15 | 1.26 | 1.00 | 6.62 | 4.73 | 5.17
Discontinued operations (in usd per share) | (0.02) | (0.18) | 0.00 | (0.01) | 1.91 | (3.27) | (0.94) | (0.79) | (0.22) | (3.10) | (0.13)
Total earnings per share - diluted (in usd per share) | $ 1.45 | $ 1.88 | $ 1.66 | $ 1.42 | $ 2.22 | $ (1.12) | $ 0.33 | $ 0.22 | $ 6.41 | $ 1.63 | $ 5.04

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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Period Type: | duration