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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017
Reconciliation of Unrecognized Tax Benefits
Balance at the beginning of the year	$ 5,503	$ 1,052	$ 846
Lapse of statute of limitations	(422)	0	0
Increase related to prior period tax positions	2,602	2,334	0
Decrease related to prior period tax positions	(183)	(241)	(36)
Increase related to current year tax positions	3,495	2,358	242
Balance at the end of the year	$ 10,995	$ 5,503	$ 1,052

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- Definition

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 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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