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Earnings Per Common Share - Additional Information (Detail)	6 Months Ended
	Mar. 30, 2013
Earnings Per Share [Line Items]
Voting rights for shareholders	Class A Common Stock has one vote per share and each share of Class B Common Stock has ten votes per share
Percentage of cash dividend on Class B Common Stock entitled to receive for each share of Class A Common Stock	110.00%
Conversion feature for Class B Common Stock	Each share is convertible into one share of Class A Common Stock at any time
Class A Common Stock
Earnings Per Share [Line Items]
Number of votes for common stock	1
Class B Common Stock
Earnings Per Share [Line Items]
Number of votes for common stock	10

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- Definition

Number of votes for common stock holders.

+ References

No definition available.

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- Definition

Percentage of cash dividend on Class B common stock entitled to receive for each share of Class A common stock.

+ References

No definition available.

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- Definition

Basis of conversion of convertible common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Definition

Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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