Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Jan. 25, 2015	Jan. 26, 2014
Income Tax [Line Items]
Net operating loss carryforward deferred tax asset attributed to excess equity deductions	$ 8,400,000
Unremitted earnings related to foreign subsidiaries	499,300,000
Percentage of uncertain tax positions evaluating criteria	50.00%
Net tax benefits, if recognized, would impact the effective tax rate	7,800,000	12,300,000
Unrecognized tax benefits, interest and penalties	293,000	293,000
Deferred Tax Assets, Valuation Allowance	75,500,000
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.
Domestic Tax Authority [Member]
Income Tax [Line Items]
Operating loss carryforwards	87,000,000
Research credits available to offset taxable income	13,600,000
Internal Revenue Service (IRS)
Income Tax [Line Items]
Alternative minimum tax credits available	1,300,000
State and local jurisdiction
Income Tax [Line Items]
Operating loss carryforwards	96,600,000
Research credits available to offset taxable income	13,800,000
Foreign Tax Authority [Member]
Income Tax [Line Items]
Research credits available to offset taxable income	32,400,000
Valuation Allowance of Deferred Tax Assets [Member]
Income Tax [Line Items]
Charged (Reversal) to Costs and Expenses	$ 14,300,000	$ 52,900,000