Derivative Financial Instruments (Details 3) - USD ($)		3 Months Ended
		Apr. 29, 2017	Apr. 30, 2016
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		5,400,000	7,252,000
Net gains (losses) from changes in cash flow hedges		124,000	(9,880,000)
Net gains reclassified to loss		(576,000)	(1,145,000)
Ending balance gain (loss)		4,948,000	(3,773,000)
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		857,000	(11,412,000)
Gain reclassified from accumulated OCI into loss on foreign exchange currency contracts	[1]	618,000	1,435,000
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		(211,000)	(699,000)
Gain reclassified from accumulated OCI into loss on foreign exchange currency contracts	[1]	79,000	32,000
Interest expense
Gains (losses) before taxes recognized on the derivative instruments designated as cash flow hedges in OCI and net loss
Loss recognized in OCI on interest rate swap		(200,000)	(132,000)
Loss reclassified from accumulated OCI into loss on interest rate swap	[1]	(36,000)	(51,000)
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	$ 500,000

[1] The Company recognized gains of $0.6 million and $0.5 million resulting from the ineffective portion related to foreign exchange currency contracts in interest income during the three months ended April 29, 2017 and April 30, 2016, respectively. There was no ineffectiveness recognized related to the interest rate swap during the three months ended April 29, 2017 and April 30, 2016.