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Restaurant Information by Ownership Type (Details) - Restaurant	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Number of Restaurants	39,096	38,298
Franchised
Segment Reporting Information [Line Items]
Number of Restaurants	36,438	35,663
Franchised | Conventional franchised
Segment Reporting Information [Line Items]
Number of Restaurants	21,781	21,758
Franchised | Developmental licensed
Segment Reporting Information [Line Items]
Number of Restaurants	7,660	7,473
Franchised | Affiliated
Segment Reporting Information [Line Items]
Number of Restaurants	6,997	6,432
Company-operated
Segment Reporting Information [Line Items]
Number of Restaurants	2,658	2,635

X

- Definition

Represents the number of restaurants.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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X

- 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.

+ Details

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- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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X

- Details

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X

- Details

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