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Uncompleted Contracts - Summary (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | May 02, 2015
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Contractors [Abstract] |  |
Costs incurred | $ 530,594 | $ 708,029
Estimated earnings | 173,356 | 237,239
Costs and estimated earnings on uncompleted contracts | 703,950 | 945,268
Less billings to date | 684,111 | 933,997
Costs in excess of billings, net | $ 19,839 | $ 11,271

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