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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Blended U.S. statutory rate	21.00%	27.00%	35.00%
Increase of liability for uncertain tax positions that impact current and future tax expense	$ 7.7
Lapses of applicable statutes of limitations
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expected decrease of unrecognized tax benefits	0.9
Federal
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Research and development tax credit carryforwards	3.5
California
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Research and development tax credit carryforwards	$ 5.2	$ 1.5
State
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards		$ 0.2

X

- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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

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