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Derivative Financial Instruments (Details) € in Thousands, £ in Thousands, SFr in Thousands, RM in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Jul. 28, 2018 CAD ($)	Jul. 28, 2018 MYR (RM)	Jul. 28, 2018 AUD ($)	Jul. 28, 2018 CHF (SFr)	Jul. 28, 2018 USD ($)	Jul. 28, 2018 EUR (€)	Jul. 28, 2018 SGD ($)	Jul. 28, 2018 GBP (£)	Apr. 28, 2018 CAD ($)	Apr. 28, 2018 MYR (RM)	Apr. 28, 2018 AUD ($)	Apr. 28, 2018 CHF (SFr)	Apr. 28, 2018 USD ($)	Apr. 28, 2018 EUR (€)	Apr. 28, 2018 SGD ($)	Apr. 28, 2018 GBP (£)
U.S. Dollars/Australian Dollars | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts			$ 4,242		$ 3,147						$ 1,400		$ 1,081
U.S. Dollars/Canadian Dollars | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts	$ 3,313				2,539				$ 2,819				2,165
U.S. Dollars/British Pounds | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts					4,738			£ 3,536					5,856			£ 4,368
U.S. Dollars/Singapore Dollars | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts					0		$ 0						236		$ 312
U.S. Dollars/Euros | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts					(428)	€ (354)							(854)	€ (708)
U.S. Dollars/Swiss Franc | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts				SFr 414	415							SFr 40	41
U.S. Dollars/Malaysian Ringgit | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts		RM 3,440			843					RM 0			0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2
Derivative
Derivatives - currency forward contract, asset					145								41
Derivatives - currency forward contracts, liability					$ (69)								$ (236)

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