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Discontinued Operations - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2015
Apr. 29, 2017
Apr. 30, 2016
Apr. 25, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net sales     $ 168,504  
Net loss from discontinued operations   $ 2,895 $ (1,500) $ (43,178)
Patterson Medical [Member] | Discontinued Operations, Disposed of by Sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Consideration receivable as per definitive agreement $ 716,886      
Percentage of common units obtained 10.00%      
Ratio of acquirer cash inflows to cash outflows at which common units obtained begin participating in distributions 2.5      
Transition services agreement, period of involvement   24 months