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Restructuring and Divestiture Charges - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Sep. 24, 2016 USD ($) | Mar. 26, 2016 USD ($) | Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($) | Jun. 27, 2015 USD ($) | Dec. 27, 2014 USD ($) | Sep. 27, 2014 USD ($) | Dec. 28, 2013 USD ($) employee | Mar. 30, 2013 USD ($) | Sep. 29, 2012 USD ($) | Sep. 24, 2016 USD ($) | Sep. 26, 2015 USD ($) | Sep. 27, 2014 USD ($) | Sep. 28, 2013 USD ($) | Sep. 29, 2012 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and divestiture charges | $ 2,900,000 | $ 3,800,000 | $ 2,300,000 | $ 6,500,000 | $ 11,900,000 | $ 8,000,000 |  |  |  |  | $ 10,500,000 | $ 28,500,000 | $ 51,700,000 |  |
Impairment charges of equipment fair value |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |  |  |  |
Loss on sale of business |  |  |  |  |  |  | $ 5,300,000 |  |  |  | 0 | (9,600,000) | (5,500,000) |  |
Restructuring Reserve, Translation and Other Adjustment |  |  |  |  | $ 9,600,000 |  |  |  |  |  |  |  |  |  |
Restructuring Charges [Member] | San Diego [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Future Charges |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |
Restructuring Charges [Member] | Bedford [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |
severance and benefits and facility closure costs |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Restructuring Charges [Member] | International [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |
Compensation charges |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |
Restructuring Charges [Member] | Fiscal 2015 Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and divestiture charges |  |  |  |  |  |  |  |  |  |  |  | 28,500,000 |  |  |
Reduction Of Workforce Expenses |  |  |  |  |  |  |  |  |  |  |  | 16,300,000 |  |  |
Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | 2,600,000 |  |  |
Fiscal 2015 Actions [Member] | Restructuring Charges [Member] | Fiscal 2015 Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Compensation charges |  |  |  |  |  |  |  |  |  |  |  | 4,100,000 |  |  |
Reduction Of Workforce Expenses |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |
Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Fiscal 2014 Actions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  | 6,300,000 |  |  |  |  | 16,600,000 |  |
Compensation charges |  |  |  |  |  |  |  | 400,000 |  |  |  |  | 1,800,000 |  |
Fiscal 2014 Actions [Member] | Jack Cumming [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  | 6,600,000 |  |  |  |  |  |  |
Compensation charges |  |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |
Fiscal 2014 Actions [Member] | Restructuring Charges [Member] | Fiscal 2015 Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction Of Workforce Expenses |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |
Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
Number Office Locations related to Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Consolidation of Diagnostics Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 |  |  |
severance and benefits and facility closure costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Employee retention program, payments in cash |  |  |  |  |  |  |  |  | $ 9,700,000 |  |  |  |  |  |
Consolidation of Diagnostics Operations [Member] | Molecular Diagnostics Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 3,000,000 | $ 3,200,000 | $ 900,000
severance and benefits and facility closure costs |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Exiting charges |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |  |
Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,800,000 | 13,300,000
Compensation charges |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,300,000 | $ 3,500,000
Consolidation of Diagnostics Operations [Member] | Restructuring Charges [Member] | Fiscal 2015 Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction Of Workforce Expenses |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |
Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Other Operating Cost Reductions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  |  |  |  |  |  |  |  |  | 300,000 | $ 8,700,000 |  |
Number of employees affected for severance benefits | employee |  |  |  |  |  |  |  | 95 |  |  |  |  |  |  |
Impairment charges of equipment fair value |  |  |  |  |  |  |  | $ 3,100,000 |  |  |  |  |  |  |
Other Operating Cost Reductions [Member] | Restructuring Charges [Member] | Fiscal 2015 Charges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction Of Workforce Expenses |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |
Facility Closure Costs |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Lease Obligations, Current | 8,000,000 |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Lease Obligations, Current | $ 12,000,000 |  |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |

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