Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019
Income Taxes
Unrecognized Tax Benefits	$ 716	$ 716	$ 551	$ 716
Unrecognized tax benefits, which would favorably impact the effective tax rate			400
Reconciliation unrecognized tax benefits:
Balance, beginning of period	716	1,688
Additions based on tax positions related to the current year	102
Additions based on tax positions related to the prior year	249
Subtractions based on tax positions related to the prior year		(443)
Settlements	(69)	(5)
Expiration of statue of limitations	(447)	(524)
Balance, end of period	$ 551	$ 716
Accrued penalties and interest
Accrued interest			100	100
Interest expense and penalties			$ 100	$ 100

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of interest expense accrued for an underpayment of income taxes.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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