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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Sep. 28, 2013
--- | --- | ---
Assets: |  |
Total assets | $ 9,990 | $ 17,820
Liabilities: |  |
Total liabilities | 4,414 | 4,165
Liability for Contingent Consideration [Member] |  |
Liabilities: |  |
Total liabilities | 4,414 | 4,165
Certificates of Deposit [Member] |  |
Assets: |  |
Total assets |  | 17,820
Short Term Investments [Member] |  |
Assets: |  |
Total assets | 9,990 |
Level 1 [Member] |  |
Assets: |  |
Total assets | 9,990 | 0
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 [Member] | Liability for Contingent Consideration [Member] |  |
Liabilities: |  |
Total liabilities | 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 | 17,820
Liabilities: |  |
Total liabilities | 0 | 0
Level 2 [Member] | Liability for Contingent Consideration [Member] |  |
Liabilities: |  |
Total liabilities | 0 | 0
Level 2 [Member] | Certificates of Deposit [Member] |  |
Assets: |  |
Total assets |  | 17,820
Level 2 [Member] | Short Term Investments [Member] |  |
Assets: |  |
Total assets | 0 |
Level 3 [Member] |  |
Assets: |  |
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 4,414 | 4,165
Level 3 [Member] | Liability for Contingent Consideration [Member] |  |
Liabilities: |  |
Total liabilities | 4,414 | 4,165
Level 3 [Member] | Certificates of Deposit [Member] |  |
Assets: |  |
Total assets |  | 0
Level 3 [Member] | Short Term Investments [Member] |  |
Assets: |  |
Total assets | $ 0 |

X
- Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant