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Revenue Recognition Contract with Customer, Asset and Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 28, 2018	Apr. 28, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 41,283	$ 30,968
Contract liabilities - current	50,629	39,379
Contract liabilities - noncurrent	8,073	$ 7,475
Dollar Change
Contract assets	10,315
Contract liabilities - current	11,250
Contract liabilities - noncurrent	$ 598
Change in Contract with Customer, Asset and Liability, Percentage [Abstract]
Contract assets percent change	33.30%
Contract liabilities, current, percent change	28.60%
Contract liabilities, noncurrent, percent change	8.00%
Revenue recognized related to contract liability	$ 23,805

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Change in Contract with Customer, Asset and Liability, Percentage [Abstract]

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Contract assets percent change

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Contract liabilities, noncurrent, percent change

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
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