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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	Jan. 26, 2019 USD ($)	Jan. 26, 2019 CAD ($)	Jan. 26, 2019 AUD ($)	Jan. 26, 2019 GBP (£)	Jan. 26, 2019 CHF (SFr)	Jan. 26, 2019 EUR (€)	Jan. 26, 2019 SGD ($)	Jan. 26, 2019 MYR (RM)	Apr. 28, 2018 USD ($)	Apr. 28, 2018 CAD ($)	Apr. 28, 2018 AUD ($)	Apr. 28, 2018 GBP (£)	Apr. 28, 2018 CHF (SFr)	Apr. 28, 2018 EUR (€)	Apr. 28, 2018 SGD ($)	Apr. 28, 2018 MYR (RM)
U.S. Dollars/Australian Dollars | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts	$ 3,800		$ 5,286						$ 1,081		$ 1,400
U.S. Dollars/Canadian Dollars | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts	623	$ 821							2,165	$ 2,819
U.S. Dollars/British Pounds | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts	0			£ 0					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	0					€ 0			(854)					€ (708)
U.S. Dollars/Swiss Franc | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts	0				SFr 0				41				SFr 40
U.S. Dollars/Malaysian Ringgit | Not Designated as Hedging Instrument
Derivative
Foreign currency exchange forward contracts	473							RM 1,966	0							RM 0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2
Derivative
Derivatives - currency forward contract, asset	20								41
Derivatives - currency forward contracts, liability	$ (24)								$ (236)

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