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Uncompleted Contracts (Tables)
 12 Months Ended
Apr. 29, 2017
Contractors [Abstract]  
Summary of Uncompleted Contracts
Uncompleted contracts consisted of the following:
 
April 29,
2017
 
April 30,
2016
Costs incurred
$
508,993

 
$
530,594

Estimated earnings
161,611

 
173,356

 
670,604

 
703,950

Less billings to date
645,098

 
684,111

 
$
25,506

 
$
19,839
Costs in Excess of Billings
Uncompleted contracts are included in the accompanying consolidated balance sheets as follows:
 
April 29,
2017
 
April 30,
2016
Costs and estimated earnings in excess of billings
$
36,403

 
$
30,200

Billings in excess of costs and estimated earnings
(10,897
)
 
(10,361
)
 
$
25,506

 
$
19,839