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Stock-based Compensation - Restricted Stock Awards and Restricted Stock Units (Details) - 2014 Stock Plan
3 Months Ended
Jul. 27, 2019
$ / shares
shares
RSAs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
EBITDA goal, percentage of likelihood 70.00%
RSAs | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares earned range, percent 0.00%
RSAs | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares earned range, percent 150.00%
RSAs | Management  
Wtd. Avg. Grant Date Fair Value  
Non-vested and unissued, beginning balance | $ / shares $ 34.09
Awarded | $ / shares 0
Vested | $ / shares 33.78
Forfeited | $ / shares 33.78
Non-vested and unissued, ending balance | $ / shares $ 34.10
RSAs | Management | 2020 EBITDA Maximum Performance  
Shares  
Non-vested and unissued, beginning balance | shares 1,031,408
Awarded | shares 0
Vested | shares (11,250)
Forfeited | shares (5,670)
Non-vested and unissued, ending balance | shares 1,014,488
RSUs  
Shares  
Non-vested and unissued, beginning balance | shares 187,844
Awarded | shares 0
Vested | shares (4,500)
Forfeited | shares 0
Non-vested and unissued, ending balance | shares 183,344
Wtd. Avg. Grant Date Fair Value  
Non-vested and unissued, beginning balance | $ / shares $ 34.55
Awarded | $ / shares 0
Vested | $ / shares 33.78
Forfeited | $ / shares 0
Non-vested and unissued, ending balance | $ / shares $ 34.57
RSUs | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 3 years
RSUs | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period 5 years