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Stock-Based Awards - Stock Options (Details) - Stock Options $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 26, 2019 USD ($) $ / shares shares
Stock Options, Outstanding [Roll Forward]
Beginning balance (in shares) | shares	636,730
Granted (in shares) | shares	28,796
Options exercised (in shares) | shares	(82,235)
Canceled (in shares) | shares	0
Ending balance (in shares) | shares	583,291
Exercisable options (in shares) | shares	512,871
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning balance (in dollars per shares) | $ / shares	$ 27.93
Options granted (in dollars per shares) | $ / shares	106.19
Options exercised (in dollars per shares) | $ / shares	10.59
Canceled (in dollars per shares) | $ / shares	0.00
Ending balance (in dollars per shares) | $ / shares	34.24
Weighted average remaining contractual life, shares exercisable (In years) | $ / shares	$ 26.43
Weighted Average Remaining Contractual Life (In years), outstanding	4 years 5 months
Aggregate Intrinsic Value (In thousands), outstanding | $	$ 17,785
Weighted Average Remaining Contractual Life (In years). exercisable	3 years 10 months 29 days
Aggregate Intrinsic Value (In thousands), exercisable | $	$ 17,785

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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