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Acquisitions Student Brands (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
MBS [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Goodwill, Acquired During Period   $ 49,282
Business Acquisition, Percentage of Voting Interests Acquired   100.00%
Finite-lived Intangible Assets Acquired   $ 21,576
Business Combination, Consideration Transferred   187,862
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   1,171
MBS [Member] | Technology-Based Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired   $ 1,500
Finite-Lived Intangible Asset, Useful Life   3 years
MBS [Member] | Noncompete Agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired   $ 500
Finite-Lived Intangible Asset, Useful Life   3 years
Student Brands [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Goodwill, Acquired During Period $ 31,782  
Business Acquisition, Percentage of Voting Interests Acquired 100.00%  
Finite-lived Intangible Assets Acquired $ 28,300  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets 1,593  
Business Combination, Consideration Transferred 61,997  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 4,626  
Student Brands [Member] | Media Content [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 14,500  
Finite-Lived Intangible Asset, Useful Life 5 years  
Student Brands [Member] | Technology-Based Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 8,000  
Finite-Lived Intangible Asset, Useful Life 5 years  
Student Brands [Member] | Noncompete Agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 4,000  
Finite-Lived Intangible Asset, Useful Life 3 years  
Student Brands [Member] | Customer Lists [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Assets Acquired $ 1,800  
Finite-Lived Intangible Asset, Useful Life 2 years