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Restructuring Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 69 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | $ 2,208 | $ 9,118 | $ 26,531 | $ 15,045 |
Restructuring and Reinvestment Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | 2,208 | 9,118 | 26,531 | 15,045 | $ 164,475
Restructuring and Reinvestment Program [Member] | Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | 1,781 | 3,420 | 25,047 | 7,999 | 112,637
Restructuring and Reinvestment Program [Member] | Process Reengineering Consulting [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | 427 | 10 | 1,948 | 16 | 20,762
Restructuring and Reinvestment Program [Member] | Other Activities [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | 0 | 5,688 | (464) | 7,030 | 31,076
Research [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | 690 | 517 | 5,138 | 677 | 25,294
Publishing [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | (392) | 1,027 | 6,933 | 1,596 | 39,422
Solutions [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | 1,277 | 1,095 | 3,447 | 1,619 | 5,998
Shared Services [Member] | Restructuring and Reinvestment Program [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges (credits) | $ 633 | $ 6,479 | $ 11,013 | $ 11,153 | $ 93,761

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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