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Acquisitions and Dispositions of Businesses (Acquisitions) (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
business
Jul. 12, 2018
business
Feb. 28, 2018
business
Jan. 31, 2018
business
Apr. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
business
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
business
May 31, 2018
Feb. 28, 2017
Business Acquisition [Line Items]                      
Number of businesses acquired | business                 6    
Acqusition purchase price | $                 $ 318,900    
Pension and other post retirement benefits liabilities | $                 (59,100)    
Purchase Price Net of Cash | $             $ 24,717 $ 299,938      
Business Acquisition, Transaction Costs | $           $ 600 600 $ 3,500      
Goodwill expected to be deductible for income tax purposes | $           700 700   $ 11,000    
Revenues of acquired companies since acquisition date | $           2,100 2,500        
Operating loss of acquired companies since acquisition date | $           $ (800) $ (900)        
Education [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business             3   2    
Acqusition purchase price | $             $ 26,200        
Education [Member] | Professional (U.S.) [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business             1        
Education [Member] | Professional (U.S.) [Member] | Professional Publications, Inc. [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                   100.00%  
Education [Member] | Test Preparation [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business     1                
Education [Member] | Kaplan International [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business       1              
Education [Member] | Kaplan International [Member] | Genesis [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                     100.00%
Education [Member] | Kaplan International [Member] | Red Marker [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired                     100.00%
Television Broadcasting [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business                 2    
Other Businesses [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business                 1    
Other Businesses [Member] | Hoover Treated Wood Products [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired         97.72%            
Purchase Price Net of Cash | $         $ 206,800            
Redeemable noncontrolling interest | $         $ 3,700            
Graham Healthcare Group [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business                 1    
Graham Healthcare Group [Member] | Hometown Home Health and Hospice [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired               100.00%      
Subsequent Event [Member] | Education [Member] | Professional (U.S.) [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business   1                  
Subsequent Event [Member] | Education [Member] | Professional (U.S.) [Member] | College for Financial Planning [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired   100.00%                  
Subsequent Event [Member] | Other Businesses [Member]                      
Business Acquisition [Line Items]                      
Number of businesses acquired | business 1                    
Subsequent Event [Member] | Other Businesses [Member] | Fernlite, Inc. [Member]                      
Business Acquisition [Line Items]                      
Percentage of interest acquired 100.00%