Derivative Financial Instruments (Details 3) - USD ($)		3 Months Ended
		May 05, 2018	Apr. 29, 2017
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net loss
Amount of ineffectiveness recognized in net loss on interest rate swap		$ 0	$ 0
Net after-tax derivative activity recorded in accumulated other comprehensive income (loss)
Beginning balance gain (loss)		(14,369,000)	5,400,000
Net gains from changes in cash flow hedges		6,468,000	124,000
Net (gains) losses reclassified to loss		1,616,000	(576,000)
Ending balance gain (loss)		(6,285,000)	4,948,000
Cost of product sales
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net loss
Gain (loss) recognized in OCI on foreign exchange currency contracts		7,422,000	857,000
Gain (loss) reclassified from accumulated OCI into loss on foreign exchange currency contracts	[1]	(1,686,000)	618,000
Other income/expense
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net loss
Gain (loss) recognized in OCI on foreign exchange currency contracts		2,000	(211,000)
Gain (loss) reclassified from accumulated OCI into loss on foreign exchange currency contracts	[1]	(201,000)	79,000
Interest expense
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net loss
Gain (loss) recognized in OCI on interest rate swap		68,000	(200,000)
Gain (loss) reclassified from accumulated OCI into loss on interest rate swap	[1]	8,000	(36,000)
Interest income
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net loss
Amount of ineffectiveness recognized in net loss on foreign exchange currency contracts		$ 600,000	$ 600,000

[1] The Company recognized gains of $0.6 million resulting from the ineffective portion related to foreign exchange currency contracts in interest income during each of the three months ended May 5, 2018 and April 29, 2017. There was no ineffectiveness recognized related to the interest rate swap during the three months ended May 5, 2018 and April 29, 2017.