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Employee Benefit Plans - Valuation of Employee Share-Based Awards - Employee Stock Purchase Rights (Details) - Employee Stock Purchase Rights - $ / shares	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	29.20%	22.20%	20.40%
Risk-free interest rate	0.30%	1.80%	1.90%
Expected dividend	3.20%	3.00%	3.00%
Expected life (in years)	1 year 3 months 18 days	1 year 3 months 18 days	1 year 3 months 18 days
Weighted-average estimated grant date fair value per share (in dollars per share)	$ 12.46	$ 10.20	$ 9.06

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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