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Commitments and Contingencies - Guarantees and Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 28, 2018	Oct. 28, 2017	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Movement in Standard Product Warranty Accrual
Beginning accrued warranty obligations			$ 29,953	$ 27,899	$ 30,496
Warranties issued during the period			9,239	11,961	10,930
Settlements made during the period			(16,715)	(17,653)	(16,790)
Changes in accrued warranty obligations for pre-existing warranties during the period, including expirations	$ 2,354	$ 3,179	1,993	7,746	3,263
Ending accrued warranty obligations	$ 29,953		24,470	29,953	27,899
Performance guarantees | Letter of credit and bank guarantees agreements
Guarantees:
Performance guarantees outstanding			13,293
Performance guarantees | Surety bonds
Guarantees:
Performance guarantees outstanding			9,900
Out-of-Home Product Application [Member]
Movement in Standard Product Warranty Accrual
Changes in accrued warranty obligations for pre-existing warranties during the period, including expirations			2,427	$ 4,539	$ 1,766
Ending accrued warranty obligations			$ 984

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Amount of loss contingency liability.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

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