Derivatives and Hedging Activities - Summary of Open Foreign Currency Contracts (Details) £ in Thousands, $ in Thousands, $ in Thousands	Jul. 26, 2020 USD ($) instrument	Jul. 26, 2020 CAD ($) instrument	Jul. 26, 2020 GBP (£) instrument	Jan. 26, 2020 USD ($) instrument	Jan. 26, 2020 CAD ($) instrument	Jan. 26, 2020 GBP (£) instrument
Derivative [Line Items]
Number of instruments | instrument	12	12	12	0	0	0
Sell USD/Buy CAD Forward Contract
Derivative [Line Items]
Number of instruments | instrument	6	6	6	0	0	0
Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Number of instruments | instrument	6	6	6	0	0	0
Sell Notional Value | Sell USD/Buy CAD Forward Contract
Derivative [Line Items]
Notional value | $	$ 8,571			$ 0
Sell Notional Value | Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Notional value | $	$ 4,508			$ 0
Buy Notional Value | Sell USD/Buy CAD Forward Contract
Derivative [Line Items]
Notional value | $		$ 12,000			$ 0
Buy Notional Value | Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Notional value | £			£ 3,600			£ 0