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Supplemental Equity Information - Summary of Changes in Carrying Amounts of Equity Attributable to Controlling Interest and Noncontrolling Interest (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |  |  |  |
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Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 Additional Paid In Capital [Member] Controlling Interest [Member] | Jun. 29, 2013 Additional Paid In Capital [Member] Controlling Interest [Member] | Jun. 28, 2014 Retained Earnings [Member] Controlling Interest [Member] | Jun. 29, 2013 Retained Earnings [Member] Controlling Interest [Member] | Jun. 28, 2014 Accumulated Other Comprehensive Income [Member] Controlling Interest [Member] | Jun. 29, 2013 Accumulated Other Comprehensive Income [Member] Controlling Interest [Member] | Jun. 28, 2014 Total [Member] Controlling Interest [Member] | Jun. 29, 2013 Total [Member] Controlling Interest [Member] | Jun. 28, 2014 Noncontrolling Interest [Member] | Jun. 29, 2013 Noncontrolling Interest [Member] | Jun. 28, 2014 Common Stock [Member] Controlling Interest [Member] | Jun. 29, 2013 Common Stock [Member] Controlling Interest [Member] | Sep. 29, 2012 Common Stock [Member] Controlling Interest [Member] | Jun. 28, 2014 Class A Common Stock [Member] Controlling Interest [Member] | Jun. 29, 2013 Class A Common Stock [Member] Controlling Interest [Member] | Jun. 28, 2014 Class B Stock [Member] Controlling Interest [Member] | Sep. 28, 2013 Class B Stock [Member] Controlling Interest [Member] | Jun. 29, 2013 Class B Stock [Member] Controlling Interest [Member] | Sep. 29, 2012 Class B Stock [Member] Controlling Interest [Member]
Beginning balance |  |  | $ 470,024 | $ 464,883 | $ 389,153 | $ 382,195 | $ 77,592 | $ 79,718 | $ 1,442 | $ 1,539 | $ 468,678 | $ 463,937 | $ 1,346 | $ 946 | $ 122 | $ 122 | $ 122 | $ 353 | $ 347 | $ 16 | $ 16 | $ 16 | $ 16
Comprehensive income (loss) | 5,673 | 14,314 | 14,437 | 21,320 |  |  | 12,874 | 20,652 | 426 | (699) | 13,300 | 19,953 | 1,137 | 1,367 |  |  |  |  |  |  |  |  |
Stock based compensation |  |  | 3,734 | 3,489 | 3,734 | 3,489 |  |  |  |  | 3,734 | 3,489 |  |  |  |  |  |  |  |  |  |  |
Restricted share activity |  |  | 3,950 | 2,482 | 3,940 | 2,478 |  |  |  |  | 3,950 | 2,482 |  |  | 1 |  |  | 9 | 4 |  |  |  |
Issuance of common stock |  |  | 998 | 1,241 | 995 | 1,240 |  |  |  |  | 998 | 1,241 |  |  |  |  |  | 3 | 1 |  |  |  |
Repurchase of common stock |  |  |  | (1,501) |  | (1,304) |  | (197) |  |  |  | (1,501) |  |  |  |  |  |  |  |  |  |  |
Tax benefit on stock option exercise |  |  | 422 | 345 | 422 | 345 |  |  |  |  | 422 | 345 |  |  |  |  |  |  |  |  |  |  |
Distribution to Noncontrolling interest |  |  | (633) | (629) |  |  |  |  |  |  |  |  | (633) | (629) |  |  |  |  |  |  |  |  |
Ending balance | $ 492,932 | $ 491,630 | $ 492,932 | $ 491,630 | $ 398,244 | $ 388,443 | $ 90,466 | $ 100,173 | $ 1,868 | $ 840 | $ 491,082 | $ 489,946 | $ 1,850 | $ 1,684 | $ 123 | $ 122 | $ 122 | $ 365 | $ 352 | $ 16 | $ 16 | $ 16 | $ 16

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568447-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686 + Details
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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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