Derivatives and Hedging Activities - Summary of Open Foreign Currency Contracts (Details) £ in Thousands, CAD in Thousands, $ in Thousands	Jul. 30, 2017 USD ($)	Jul. 30, 2017 GBP (£)	Jul. 30, 2017 CAD
Derivative [Line Items]
Number of Instruments	12	12	12
Sell USD/Buy CAD Forward Contract [Member]
Derivative [Line Items]
Number of Instruments	6	6	6
Sell USD/Buy GBP Forward Contract [Member]
Derivative [Line Items]
Number of Instruments	6	6	6
Short [Member] | Sell USD/Buy CAD Forward Contract [Member]
Derivative [Line Items]
Notional Value	$ 9,944
Short [Member] | Sell USD/Buy GBP Forward Contract [Member]
Derivative [Line Items]
Notional Value	$ 5,519
Long [Member] | Sell USD/Buy CAD Forward Contract [Member]
Derivative [Line Items]
Notional Value | CAD			CAD 13,500
Long [Member] | Sell USD/Buy GBP Forward Contract [Member]
Derivative [Line Items]
Notional Value | £		£ 4,500