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Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Nov. 01, 2018
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Oct. 31, 2018
Apr. 30, 2018
Acquisitions [Abstract]              
Net cash payment for acquisition       $ 190,467 $ 0    
Goodwill   $ 1,103,222   1,103,222     $ 1,019,801
Identifiable intangible assets acquired and weighted-average useful life [Abstract]              
Identifiable intangible assets acquired   671,441   671,441     615,244
Revenue   449,367 $ 455,675 1,308,890 1,318,850    
Operating loss   50,346 $ 65,394 [1] 143,961 $ 158,752 [1]    
Solutions [Member]              
Acquisitions [Abstract]              
Goodwill   374,808   374,808     272,531
Customer Relationships [Member]              
Identifiable intangible assets acquired and weighted-average useful life [Abstract]              
Identifiable intangible assets acquired   251,855 [2]   251,855 [2]     $ 161,729
The Learning House, Inc. [Member]              
Acquisitions [Abstract]              
Percentage of ownership interest acquired           100.00%  
Consideration transferred $ 201,300            
Payment to acquire business, gross 200,800            
Cash acquired 10,300            
Net cash payment for acquisition 190,500            
Identifiable intangible assets acquired and weighted-average useful life [Abstract]              
Identifiable intangible assets acquired   109,500   109,500      
The Learning House, Inc. [Member] | Solutions [Member]              
Acquisitions [Abstract]              
Goodwill           $ 109,100  
Net liabilities assumed           (17,300)  
Goodwill deductible for tax purposes           0  
Identifiable intangible assets acquired and weighted-average useful life [Abstract]              
Identifiable intangible assets acquired           $ 109,500  
Revenue   13,400   13,400      
Operating loss   (5,200)   (5,200)      
The Learning House, Inc. [Member] | Warrants [Member]              
Acquisitions [Abstract]              
Issuance of warrants $ 500            
The Learning House, Inc. [Member] | Warrants [Member] | Common Stock Class A [Member]              
Acquisitions [Abstract]              
Number of shares of common stock warrantholders are allowed to purchase (in shares)           400,000  
Exercise price per share (in dollars per share)           $ 90.00  
The Learning House, Inc. [Member] | Customer Relationships [Member]              
Identifiable intangible assets acquired and weighted-average useful life [Abstract]              
Identifiable intangible assets acquired   103,800   $ 103,800      
Weighted-average useful life       15 years      
The Learning House, Inc. [Member] | Course Content [Member]              
Identifiable intangible assets acquired and weighted-average useful life [Abstract]              
Identifiable intangible assets acquired   $ 5,700   $ 5,700      
Weighted-average useful life       4 years      
[1] Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $6.0 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 three and nine months ended January 31, 2018, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended January 31, 2018 was $1.0 million in Research, $0.6 million in Publishing, and $0.4 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the nine months ended January 31, 2018 was $3.1 million in Research, $1.7 million in Publishing, and $1.2 million in Corporate expenses.
[2] As of January 31, 2019, amounts include intangible assets acquired as part of the acquisition of Learning House on November 1, 2018. Refer to Note 3, "Acquisition," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information related to the acquisition of Learning House.