Derivative Financial Instruments - Gains (Losses) Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net earnings (loss)
Gains (losses) arising during the period	$ 1,465	$ 859	$ (2,896)	$ 7,581
Gains (losses) reclassified from accumulated OCI into earnings (loss)	1,737	2,854	6,187	4,931
Foreign exchange currency contracts | Cost of product sales
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net earnings (loss)
Gains (losses) arising during the period	1,314	958	(2,034)	8,676
Gains (losses) reclassified from accumulated OCI into earnings (loss)	1,804	2,826	6,299	4,813
Interest rate swap | Interest expense
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net earnings (loss)
Gains (losses) arising during the period	151	(99)	(862)	(1,095)
Gains (losses) reclassified from accumulated OCI into earnings (loss)	$ (67)	$ 28	$ (112)	$ 118