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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.

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