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Cash Flow Information - Change in Operating Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
May 02, 2015
Apr. 26, 2014
(Increase) decrease:      
Restricted cash $ 298 $ 18 $ (466)
Accounts receivable 3,789 6,412 (18,293)
Long-term receivables 2,851 3,234 3,027
Inventories (5,100) (1,907) (12,771)
Costs and estimated earnings in excess of billings 4,867 (1,667) 5,955
Prepaid expenses and other current assets 1,290 (575) (536)
Income taxes receivable 1,061 (3,084) (2,414)
Advertising rights and other assets (776) 912 64
Increase (decrease):      
Current marketing obligations and other payables 21 (146) 372
Accounts Payable (9,926) 5,594 6,701
Customer deposits (941) (1,315) 4,931
Accrued expenses 476 2,860 165
Warranty obligations 4,726 (2,638) 543
Billings in excess of costs and estimated earnings (13,436) 1,314 8,238
Long-term warranty obligations (710) 1,869 1,560
Income taxes payable (40) (666) (527)
Deferred revenue 2,120 (250) (836)
Long-term marketing obligations and other payables (456) 3,468 (501)
Change in operating assets and liabilities $ (9,886) $ 13,433 $ (4,788)