Derivatives and Hedging Activities - Summary of Open Foreign Currency Contracts (Details) £ in Thousands, $ in Thousands, $ in Thousands	Apr. 26, 2020 CAD ($) instrument	Apr. 26, 2020 GBP (£) instrument	Apr. 26, 2020 USD ($) instrument	Jan. 26, 2020 CAD ($) instrument	Jan. 26, 2020 GBP (£) instrument	Jan. 26, 2020 USD ($) instrument
Derivative [Line Items]
Number of Instruments | instrument	18	18	18	0	0	0
Sell USD/Buy CAD Forward Contract
Derivative [Line Items]
Number of Instruments | instrument	9	9	9	0	0	0
Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Number of Instruments | instrument	9	9	9	0	0	0
Sell Notional Value | Sell USD/Buy CAD Forward Contract
Derivative [Line Items]
Notional Value | $			$ 12,851			$ 0
Sell Notional Value | Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Notional Value | $			$ 6,760			$ 0
Buy Notional Value | Sell USD/Buy CAD Forward Contract
Derivative [Line Items]
Notional Value | $	$ 18,000			$ 0
Buy Notional Value | Sell USD/Buy GBP Forward Contract
Derivative [Line Items]
Notional Value | £		£ 5,400			£ 0