Income Taxes - Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal income tax at statutory rate	$ 12,775	$ (44,968)	$ 86
State income taxes, net of federal benefit	(100)	(1,260)	(2,472)
Foreign taxes at rates less than federal rates	(11,960)	(8,378)	(9,655)
Tax credits generated	(5,302)	(5,523)	(5,328)
Changes in valuation allowance	14,284	52,942	2,703
Goodwill impairment	0	40,840	0
Changes in uncertain tax positions	(5,167)	893	132
Deemed dividends	2,513	726	1,101
Equity compensation	2,200	1,173	793
Permanent differences	(93)	2,895	1,571
Sales exclusion - foreign jurisdiction	0	0	10,689
Dividend and U.S. tax on foreign earnings	0	0	(23,443)
Revaluation of deferred tax assets and liabilities	(432)	(12)	3,510
Other	(170)	(3,343)	1
Provision (benefit) for taxes	$ 8,548	$ 35,985	$ (41,690)