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Stockholders' Equity - Share-Based Awards Available for Grant (Details) - shares | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Shares available for Grant, Beginning (in shares) | 21,058,000 | 22,791,000 | 25,164,000
Restricted stock units granted (in shares) | 6,111,000 | 5,639,000 | 6,504,000
Options granted (in shares) | (382,000) | (487,000) | (455,000)
Share-based awards canceled/forfeited/expired (in shares) | 3,482,000 | 4,393,000 | 4,586,000
Shares available for Grant, Ending (in shares) | 18,047,000 | 21,058,000 | 22,791,000
Pool shares reduced for each share granted (in shares) | 2.3 |  |
Pool shares increased for each share forfeited (in shares) | 2.3 |  |

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- Definition Pool Shares Increased For Each Share Forfeited + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Pool Shares Reduced For Each Share Granted + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted stock units granted. + References No definition available. + Details
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Namespace Prefix: | intu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Share-based Awards Canceled Forfeited In Period + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Period Type: | instant

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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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