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Restaurant Information by Ownership Type (Details) - Restaurant	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Number of Restaurants	38,298	37,557
Franchised
Segment Reporting Information [Line Items]
Number of Restaurants	35,663	34,745
Franchised | Conventional franchised
Segment Reporting Information [Line Items]
Number of Restaurants	21,758	21,586
Franchised | Developmental licensed
Segment Reporting Information [Line Items]
Number of Restaurants	7,473	7,103
Franchised | Affiliated
Segment Reporting Information [Line Items]
Number of Restaurants	6,432	6,056
Company-operated
Segment Reporting Information [Line Items]
Number of Restaurants	2,635	2,812

X

- Definition

Represents the number of restaurants.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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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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