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Restaurant Information by Ownership Type (Detail) - Restaurant	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Number of Restaurants	36,976	36,615
Franchised
Segment Reporting Information [Line Items]
Number of Restaurants	33,746	30,559
Franchised | Conventional franchised
Segment Reporting Information [Line Items]
Number of Restaurants	21,214	21,456
Franchised | Developmental licensed
Segment Reporting Information [Line Items]
Number of Restaurants	6,824	5,742
Franchised | Affiliated
Segment Reporting Information [Line Items]
Number of Restaurants	5,708	3,361
Company-operated
Segment Reporting Information [Line Items]
Number of Restaurants	3,230	6,056

X

- Definition

Represents the number of restaurants.

+ References

No definition available.

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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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- Details

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X

- Details

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