Long-term debt (Tables)

6 Months Ended

Jul. 27, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

	July 27, 2014			January 26, 2014
	(In thousands)
Amount of the equity component	$	125,725		$	125,725
1.00% convertible senior notes due 2018	$	1,500,000		$	1,500,000
Unamortized debt discount (1)	(129,751		)	(143,625		)
Net carrying amount	$	1,370,249		$	1,356,375

(1) As of July 27, 2014, the unamortized debt discount will be amortized over a remaining period of 4.4 years.

The following table presents the interest expense for the contractual interest and the accretion of debt discount and issuance costs:

	Three Months Ended				Six Months Ended
	July 27,		July 28,		July 27,		July 28,
	2014		2013		2014		2013
	(In thousands)
Contractual coupon interest expense	$	3,750	$	—	$	7,500	$	—
Amortization of debt discount	6,973		—		13,874		—
Amortization of debt issuance costs	49		—		97		—
Total interest expense related to Notes	$	10,772	$	—	$	21,471	$	—