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Cash Flow Information - Change in Operating Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
(Increase) decrease:      
Restricted cash $ (18) $ 298 $ 18
Accounts receivable (2,718) 3,789 6,412
Long-term receivables 2,213 2,851 3,234
Inventories 3,581 (5,100) (1,907)
Costs and estimated earnings in excess of billings (6,203) 4,867 (1,667)
Prepaid expenses and other current assets (980) 1,290 (575)
Income taxes receivable 4,201 1,061 (3,084)
Investment in affiliates and other assets (475) (776) 912
Increase (decrease):      
Current marketing obligations and other payables 857 21 (146)
Accounts Payable 5,544 (9,926) 5,594
Customer deposits (1,514) (941) (1,315)
Accrued expenses 2,351 776 3,128
Warranty obligations (2,986) 4,726 (2,638)
Billings in excess of costs and estimated earnings 536 (13,436) 1,314
Long-term warranty obligations 389 (710) 1,869
Income taxes payable 1,331 (37) (627)
Deferred revenue 1,256 2,120 (250)
Long-term marketing obligations and other payables (43) (456) 3,468
Change in operating assets and liabilities $ 7,322 $ (9,583) $ 13,740