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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 27, 2015 | Sep. 27, 2014 | Jun. 28, 2014
--- | --- | --- | ---
Assets: |  |  |
Total assets |  | $ 9,990 | $ 14,220
Liabilities: |  |  |
Total liabilities | $ 4,343 | 4,414 | 4,414
Liability for Contingent Consideration [Member] |  |  |
Liabilities: |  |  |
Total liabilities | 4,343 | 4,414 | 4,414
Certificates of Deposit [Member] |  |  |
Assets: |  |  |
Total assets |  |  | 14,220
Short Term Investments [Member] |  |  |
Assets: |  |  |
Total assets |  | 9,990 |
Level 1 [Member] |  |  |
Assets: |  |  |
Total assets |  | 9,990 | 0
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 1 [Member] | Liability for Contingent Consideration [Member] |  |  |
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 1 [Member] | Certificates of Deposit [Member] |  |  |
Assets: |  |  |
Total assets |  |  | 0
Level 1 [Member] | Short Term Investments [Member] |  |  |
Assets: |  |  |
Total assets |  | 9,990 |
Level 2 [Member] |  |  |
Assets: |  |  |
Total assets |  | 0 | 14,220
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 2 [Member] | Liability for Contingent Consideration [Member] |  |  |
Liabilities: |  |  |
Total liabilities | 0 | 0 | 0
Level 2 [Member] | Certificates of Deposit [Member] |  |  |
Assets: |  |  |
Total assets |  |  | 14,220
Level 2 [Member] | Short Term Investments [Member] |  |  |
Assets: |  |  |
Total assets |  | 0 |
Level 3 [Member] |  |  |
Assets: |  |  |
Total assets |  | 0 | 0
Liabilities: |  |  |
Total liabilities | 4,343 | 4,414 | 4,414
Level 3 [Member] | Liability for Contingent Consideration [Member] |  |  |
Liabilities: |  |  |
Total liabilities | $ 4,343 | 4,414 | 4,414
Level 3 [Member] | Certificates of Deposit [Member] |  |  |
Assets: |  |  |
Total assets |  |  | $ 0
Level 3 [Member] | Short Term Investments [Member] |  |  |
Assets: |  |  |
Total assets |  | $ 0 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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