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Uncompleted Contracts - Summary (Details) - USD ($) $ in Thousands | Apr. 29, 2017 | Apr. 30, 2016
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Contractors [Abstract] |  |
Costs incurred | $ 508,993 | $ 530,594
Estimated earnings | 161,611 | 173,356
Costs and estimated earnings on uncompleted contracts | 670,604 | 703,950
Less billings to date | 645,098 | 684,111
Costs in excess of billings, net | $ 25,506 | $ 19,839

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