Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Revenue Recognition - Narratives (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 25, 2020	Jan. 26, 2019	Jan. 27, 2018
Revenue Recognition
Revenue	$ 397,716	$ 318,734	$ 342,321	$ 306,264	$ 354,065	$ 267,180	$ 288,493	$ 256,161	$ 1,365,035	$ 1,165,899	$ 950,528
Gift card liability	$ 9,224				$ 7,784				$ 9,224	7,784
Amortization period of capitalized contract costs	7 years								7 years
Gift Card Redemption
Revenue Recognition
Revenue									$ 16,300	16,300	12,900
Revenue recognized									3,600	3,000	2,200
Credit Card Program
Revenue Recognition
Revenue									$ 3,700	$ 3,200	$ 1,200