Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Income Tax [Line Items]
Net operating loss carryforward deferred tax asset attributed to excess equity deductions	$ 8,400
Unremitted earnings related to foreign subsidiaries	$ 516,800
Percentage of uncertain tax positions evaluating criteria	50.00%
Net tax benefits, if recognized, would impact the effective tax rate	$ 8,400	$ 7,800
Unrecognized tax benefits, interest and penalties	300	300
Valuation allowance	$ 77,383	75,536	$ 61,251	$ 8,320
Valuation allowance, methodologies and assumptions	The Company assessed whether a valuation allowance should be recorded against all of its deferred tax assets (“DTAs”) based on the consideration of all available evidence, using a “more likely than not” realization standard. The four sources of taxable income that must be considered in determining whether DTAs will be realized are, (1) future reversals of existing taxable temporary differences (i.e., offset of gross deferred tax assets against gross deferred tax liabilities); (2) taxable income in prior carryback years, if carryback is permitted under the tax law; (3) tax planning strategies and (4) future taxable income exclusive of reversing temporary differences and carryforwards. In assessing whether a valuation allowance is required, significant weight is to be given to evidence that can be objectively verified. The Company evaluated its DTAs each reporting period, including an assessment of the cumulative income or loss over the most recent three-year period, to determine if a valuation allowance was required. A significant negative factor in the assessment was the Company’s three-year cumulative loss history as of January 25, 2015 and January 26, 2014 in Canada and the U.S. After a review of the four sources of taxable income described above and in view of its three-year cumulative losses, the Company was not able to conclude that it is more likely than not that its DTAs in Canada and the U.S. at January 25, 2015 and January 26, 2014 will be realized.
Benefit to income tax provision from release of valuation allowance on Canadian deferred tax asset	$ 7,208	$ 0	$ 0
Net charge to income tax provision from increase in valuation allowance	1,800
Domestic Tax Authority [Member]
Income Tax [Line Items]
Operating loss carryforwards	114,700
Research credits available to offset taxable income	13,300
Internal Revenue Service (IRS)
Income Tax [Line Items]
Alternative minimum tax credits available	1,300
State and local jurisdiction
Income Tax [Line Items]
Operating loss carryforwards	97,400
Research credits available to offset taxable income	13,900
Foreign Tax Authority [Member]
Income Tax [Line Items]
Research credits available to offset taxable income	24,700
Valuation Allowance of Deferred Tax Assets [Member]
Income Tax [Line Items]
Charge to income tax provision as a result of increase in valuation allowance	$ 9,055