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Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) [Abstract]                      
Revenue, net $ 474,700 $ 467,100 $ 466,200 $ 423,500 $ 491,200 $ 449,400 $ 448,600 $ 410,900 $ 1,831,483 $ 1,800,069 $ 1,796,103
Gross profit 324,100 313,200 322,800 280,400 340,700 305,500 316,000 283,100 1,240,500 1,245,300  
Operating (Loss) Income (170,700) 48,500 63,400 4,500 80,100 50,300 57,500 36,100 (54,287) 223,989 231,461
Net (Loss) Income $ (158,000) $ 35,400 $ 44,700 $ 3,600 $ 63,300 $ 34,900 $ 43,800 $ 26,300 $ (74,287) $ 168,263 $ 192,186
(Loss) Earnings Per Share [Abstract]                      
Basic (in dollars per share) $ (2.83) [1],[2] $ 0.63 [2] $ 0.79 [2] $ 0.06 [2] $ 1.11 [2] $ 0.61 [2] $ 0.76 [2] $ 0.46 [2] $ (1.32) [1],[2] $ 2.94 [2] $ 3.37
Diluted (in dollars per share) $ (2.83) [1],[2] $ 0.63 [2] $ 0.79 [2] $ 0.06 [2] $ 1.10 [2] $ 0.61 [2] $ 0.76 [2] $ 0.45 [2] $ (1.32) [1],[2] $ 2.91 [2] $ 3.32
[1] In calculating diluted net (loss) earnings per common share for the fourth quarter and year ended April 30, 2020, our diluted weighted average number of common shares outstanding excludes the effect of unvested restricted stock units and other stock awards as the effect was anti-dilutive. This occurs when a U.S. GAAP net loss is reported and the effect of using dilutive shares is antidilutive.
[2] The sum of the quarterly earnings per share amounts may not agree to the respective annual amounts due to rounding.