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Supplementary Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) [Abstract]                      
Revenue, net $ 491,200 $ 449,400 $ 448,600 $ 410,900 $ 477,300 $ 455,700 $ 451,700 $ 411,400 $ 1,800,069 $ 1,796,103 $ 1,718,530
Gross profit 340,700 305,500 316,000 283,100 340,700 319,300 319,600 285,500 1,245,300 1,265,100  
Operating income 80,100 50,300 57,500 36,100 72,700 65,400 80,800 12,600 223,989 231,461 [1] 211,470 [1]
Net income $ 63,300 $ 34,900 $ 43,800 $ 26,300 $ 54,200 $ 68,800 $ 60,000 $ 9,200 $ 168,263 $ 192,186 $ 113,643
Earnings Per Share [Abstract]                      
Basic (in dollars per share) $ 1.11 [2] $ 0.61 [2] $ 0.76 [2] $ 0.46 [2] $ 0.95 [2] $ 1.21 [2] $ 1.06 [2] $ 0.16 [2] $ 2.94 $ 3.37 $ 1.98
Diluted (in dollars per share) $ 1.10 [2] $ 0.61 [2] $ 0.76 [2] $ 0.45 [2] $ 0.93 [2] $ 1.19 [2] $ 1.04 [2] $ 0.16 [2] $ 2.91 $ 3.32 $ 1.95
[1] Due to the retrospective adoption of ASU 2017-07, total net benefits (costs) of $8.1 million and $(5.3) million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other for the years ended April 30, 2018 and 2017, respectively. Refer to Note 2, "Summary of Significant Accounting Policies, Recently Issued, and Recently Adopted Accounting Standards," for more information. The impact of the reclassification on Contribution to Profit by segment for the year ended April 30, 2018 was $4.2 million in Research, $2.3 million in Publishing, and $1.6 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the year ended April 30, 2017 was $1.6 million in Research, $1.2 million in Publishing, and $(8.1) million in Corporate expenses.
[2] The sum of the quarterly earnings per share amounts may not agree to the respective annual amounts due to rounding.