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Selected Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
May 31, 2018
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Quarterly Financial Data [Abstract]                      
Sales revenue, net $ 442,365 $ 474,737 $ 413,995 $ 376,335 $ 384,843 $ 431,081 $ 393,548 $ 354,679 $ 1,707,432 $ 1,564,151 $ 1,478,845
Gross profit 192,615 209,973 178,151 153,727 157,530 181,845 155,173 146,558 734,466 641,106 611,199
Asset impairment charges 41,000 0 0 0 0 0 0 0 41,000 0 15,447
Restructuring charges 2,252 12 430 619 977 25 859 1,725 3,313 3,586 1,857
Income (loss) from continuing operations (3,155) 68,699 46,095 40,694 37,714 54,320 44,017 38,173 152,333 174,224 128,882
Loss from discontinued operations $ 0 $ 0 $ 0 $ 0 $ (448) $ (4,850) $ 0 $ (381) $ 0 $ (5,679) $ (84,436)
Earnings (loss) per share - basic                      
Continuing operations (in dollars per share) $ (0.13) $ 2.73 $ 1.84 $ 1.63 $ 1.49 $ 2.08 $ 1.67 $ 1.44 $ 6.06 $ 6.68 $ 4.76
Discontinued operations (in dollars per share) 0 0 0 0 (0.02) (0.19) 0 (0.01) 0 (0.22) (3.12)
Total earnings per share - basic (in dollars per share) (0.13) 2.73 1.84 1.63 1.47 1.90 1.67 1.42 6.06 6.46 1.64
Earnings (loss) per share - diluted                      
Continuing operations (in dollars per share) (0.13) 2.71 1.83 1.61 1.47 2.06 1.66 1.43 6.02 6.62 4.73
Discontinued operations (in dollars per share) 0 0 0 0 (0.02) (0.18) 0 (0.01) 0 (0.22) (3.10)
Total earnings per share - diluted (in dollars per share) $ (0.13) $ 2.71 $ 1.83 $ 1.61 $ 1.45 $ 1.88 $ 1.66 $ 1.42 $ 6.02 $ 6.41 $ 1.63