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Property and Equipment - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Property, Plant and Equipment [Abstract] |  |  |
Capitalized software costs | $ 78 | $ 79 | $ 86
Capitalized labor costs | $ 40 | $ 43 | $ 45

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- Definition Capitalized Labor Costs + References No definition available. + Details
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Namespace Prefix: | intu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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