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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 7 years 9 months 9 years 3 months 7 days
Gross Carrying Amount $ 6,646 $ 7,722
Accumulated Amortization 2,964 2,187
Finite-Lived Intangible Assets, Accumulated Impairment Loss 0 830
Definite-lived, Net Value 3,682 4,705
Intangibles, net $ 3,682 $ 4,705
Trademarks    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 20 years 20 years
Gross Carrying Amount $ 709 $ 1,604
Accumulated Amortization 118 429
Finite-Lived Intangible Assets, Accumulated Impairment Loss 0 604
Definite-lived, Net Value $ 591 $ 571
Computer Software, Intangible Asset [Member]    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 3 years 3 years
Gross Carrying Amount $ 2,978 $ 2,814
Accumulated Amortization 2,109 1,055
Finite-Lived Intangible Assets, Accumulated Impairment Loss 0 0
Definite-lived, Net Value $ 869 $ 1,759
Customer Relationships [Member]    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 10 years 9 years 8 months 12 days
Gross Carrying Amount $ 2,859 $ 3,209
Accumulated Amortization 637 608
Finite-Lived Intangible Assets, Accumulated Impairment Loss 0 226
Definite-lived, Net Value $ 2,222 $ 2,375
Other    
Schedule of Definite-Lived Intangible and Indefinite-Lived Intangible Assets [Line Items]    
Weighted Average Life (in years) 1 year 1 year
Gross Carrying Amount $ 100 $ 95
Accumulated Amortization 100 95
Finite-Lived Intangible Assets, Accumulated Impairment Loss 0 0
Definite-lived, Net Value $ 0 $ 0