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Derivative Financial Instruments (Details) € in Thousands, £ in Thousands, SGD in Thousands, SFr in Thousands, CAD in Thousands, AUD in Thousands, $ in Thousands	Jan. 27, 2018 CAD	Jan. 27, 2018 AUD	Jan. 27, 2018 CHF (SFr)	Jan. 27, 2018 USD ($)	Jan. 27, 2018 EUR (€)	Jan. 27, 2018 SGD	Jan. 27, 2018 GBP (£)	Apr. 29, 2017 CAD	Apr. 29, 2017 AUD	Apr. 29, 2017 CHF (SFr)	Apr. 29, 2017 USD ($)	Apr. 29, 2017 EUR (€)	Apr. 29, 2017 SGD	Apr. 29, 2017 GBP (£)
U.S. Dollars/Australian Dollars
Derivative
Foreign Currency Exchange Forward Contracts:		AUD 3,408		$ 2,615					AUD 10,669		$ 7,984
U.S. Dollars/Canadian Dollars
Derivative
Foreign Currency Exchange Forward Contracts:	CAD 1,864			1,424				CAD 345			256
U.S. Dollars/British Pounds
Derivative
Foreign Currency Exchange Forward Contracts:				6,402			£ 4,778				4,936			£ 3,959
U.S. Dollars/Singapore Dollars
Derivative
Foreign Currency Exchange Forward Contracts:				237		SGD 312					605		SGD 844
U.S. Dollars/Euros
Derivative
Foreign Currency Exchange Forward Contracts:											528	€ 491
U.S. Dollars/Swiss Franc
Derivative
Foreign Currency Exchange Forward Contracts:			SFr 989	998						SFr 0	0
Estimate of Fair Value Measurement [Member] | Recurring Basis | Level 2
Derivative
Derivatives - currency forward contract, asset				64							64
Derivatives - currency forward contracts, liability				720							$ 277
Short [Member] | U.S. Dollars/Euros
Derivative
Foreign Currency Exchange Forward Contracts:				$ 1,277	€ 1,061

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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+ References

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- Definition

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+ References

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