Investments (Tables)

12 Months Ended

Jan. 25, 2015

Investments [Abstract]

Summary of investments

The following table summarizes the Company’s available-for-sale investments:

	January 25, 2015						January 26, 2014
(in thousands)	Market Value		Adjusted Cost		Gross Unrealized Gain		Market Value		Adjusted Cost		Gross Unrealized Gain
Agency securities	$	23,271	$	23,271	$	—	$	18,258	$	18,257	$	1
Bank time deposits	—		—		—		—		—		—
Total investments	$	23,271	$	23,271	$	—	$	18,258	$	18,257	$	1

Schedule of investments, classified by maturity period

The following table summarizes the maturities of the Company’s available-for-sale investments:

	January 25, 2015				January 26, 2014
(in thousands)	Market Value		Adjusted Cost		Market Value		Adjusted Cost
Within 1 year	$	23,271	$	23,271	$	14,584	$	14,584
After 1 year through 5 years	—		—		3,674		3,673
Total investments	$	23,271	$	23,271	$	18,258	$	18,257

Summary of unrealized gains (losses) on investments

The following table summarizes net unrealized losses arising in the periods presented in addition to the tax associated with these comprehensive income items:

	Fiscal Year Ended
(in thousands)	January 25, 2015		January 26, 2014			January 27, 2013
Unrealized loss, net of tax	$	—	$	(5	)	$	(32	)
Decrease to deferred tax liability	$	—	$	(2	)	$	(10	)

Schedule of interest income generated from investments

The following table summarizes interest income generated from investments and cash and cash equivalents:

	Fiscal Year Ended
(in thousands)	January 25, 2015		January 26, 2014		January 27, 2013
Interest income	$	43	$	342	$	404