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Other Intangible Assets - Components of Gross and Net Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
--- | --- | --- | ---
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | $ 201,100 | $ 172,100 | $ 144,100
Accumulated Amortization | (57,800) | (49,000) | (43,200)
Accumulated Impairment | (27,200) | (27,200) | (25,400)
Net Carrying Value | 116,067 | 95,865 | 75,500
Marketing-Related Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 79,600 | 77,900 | 73,700
Accumulated Amortization | (12,700) | (11,300) | (10,400)
Accumulated Impairment | (26,000) | (26,000) | (24,200)
Net Carrying Value | 40,900 | 40,600 | 39,100
Other Acquired Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 29,900 | 28,600 | 27,100
Accumulated Amortization | (12,900) | (11,600) | (10,500)
Accumulated Impairment | (1,200) | (1,200) | (1,200)
Net Carrying Value | 15,800 | 15,800 | 15,400
Amortizable | Marketing-Related Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 16,900 | 14,900 | 14,100
Accumulated Amortization | (12,700) | (11,300) | (10,400)
Accumulated Impairment | 0 | 0 | 0
Net Carrying Value | 4,200 | 3,600 | 3,700
Amortizable | Customer-Related Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 91,600 | 65,600 | 43,300
Accumulated Amortization | (32,200) | (26,100) | (22,300)
Accumulated Impairment | 0 | 0 | 0
Net Carrying Value | 59,400 | 39,500 | 21,000
Amortizable | Other Acquired Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 22,100 | 20,800 | 19,300
Accumulated Amortization | (12,900) | (11,600) | (10,500)
Accumulated Impairment | 0 | 0 | 0
Net Carrying Value | 9,200 | 9,200 | 8,800
Nonamortizable | Marketing-Related Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 62,700 | 63,000 | 59,600
Accumulated Amortization | 0 | 0 | 0
Accumulated Impairment | (26,000) | (26,000) | (24,200)
Net Carrying Value | 36,700 | 37,000 | 35,400
Nonamortizable | Other Acquired Intangible Assets |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Gross | 7,800 | 7,800 | 7,800
Accumulated Amortization | 0 | 0 | 0
Accumulated Impairment | (1,200) | (1,200) | (1,200)
Net Carrying Value | $ 6,600 | $ 6,600 | $ 6,600

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