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Acquisition - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 05, 2017
Apr. 01, 2018
Dec. 30, 2018
Business Acquisition [Line Items]      
Additions to Goodwill     $ 0.2
Teachers On Call, Inc.      
Business Acquisition [Line Items]      
Ownership percentage acquired 100.00%    
Purchase price of acquisition $ 41.0    
Purchase price paid at closing 39.0    
Additions to Goodwill   $ 0.2  
Goodwill expected to be deductible     18.8
Indemnification asset recognized as of the acquisition date $ 2.8    
Indemnification asset     $ 0.1