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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