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Cash Flow Information - Change in Operating Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
(Increase) decrease:
Account receivable	$ 10,856	$ 2,266	$ (2,718)
Long-term receivables	329	1,548	2,213
Inventories	(4,076)	(8,517)	3,581
Contract assets	3,040	(5,911)	6,203
Prepaid expenses and other current assets	472	(1,252)	(980)
Income taxes receivables	4,250	(4,747)	4,201
Investment in affiliates and other assets	(48)	(413)	611
Increase (decrease):
Accounts payable	(2,747)	(2,573)	5,544
Contract liabilities	10,774	3,480	278
Accrued expenses	4,631	3,472	3,208
Warranty obligations	(4,393)	346	(2,986)
Long-term warranty obligations	(1,079)	1,729	389
Income taxes payable	(3,023)	(592)	1,331
Long-term marketing obligations and other payables	(1,116)	379	(43)
Change in operating assets and liabilities	$ 11,886	$ 1,863	$ 7,204

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Increase (Decrease) In Long-Term Warranty Obligation

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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