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Restructuring and Related Charges, Pre-tax Restructuring Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | $ 28,566 | $ 13,355 | $ 28,611
Restructuring and Reinvestment Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 28,566 | 13,355 | 28,611
Restructuring and related charges incurred to date | 166,510 |  |
Restructuring and Reinvestment Program [Member] | Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 27,213 | 8,386 | 16,443
Restructuring and related charges incurred to date | 114,803 |  |
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 1,815 | 148 | 7,191
Restructuring and related charges incurred to date | 20,629 |  |
Restructuring and Reinvestment Program [Member] | Other Activities [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | (462) | 4,821 | 4,977
Restructuring and related charges incurred to date | 31,078 |  |
Research [Member] | Restructuring and Reinvestment Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 5,257 | 1,949 | 2,982
Restructuring and related charges incurred to date | 25,413 |  |
Publishing [Member] | Restructuring and Reinvestment Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 6,443 | 1,596 | 4,507
Restructuring and related charges incurred to date | 38,931 |  |
Solutions [Member] | Restructuring and Reinvestment Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 3,695 | 1,787 | 1,042
Restructuring and related charges incurred to date | 6,247 |  |
Corporate Expenses [Member] | Restructuring and Reinvestment Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related charges | 13,171 | $ 8,023 | $ 20,080
Restructuring and related charges incurred to date | $ 95,919 |  |

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