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Income Taxes - Significant Components of Company's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Sep. 24, 2016 | Sep. 26, 2015
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforwards | $ 40.0 | $ 45.4
Capital losses | 19.1 | 25.7
Non-deductible accruals | 21.1 | 16.3
Non-deductible reserves | 31.1 | 26.8
Stock-based compensation | 34.8 | 24.3
Research and other credits | 10.7 | 14.5
Nonqualified deferred compensation plan | 14.1 | 11.3
Other temporary differences | 9.2 | 10.2
Deferred tax assets, gross | 180.1 | 174.5
Less: valuation allowance | (46.2) | (60.9)
Deferred tax assets, net | 133.9 | 113.6
Deferred tax liabilities |  |
Depreciation and amortization | (1,030.8) | (1,171.5)
Debt discounts and deferrals | (75.1) | (100.1)
Deferred Tax Liabilities, Deferred Expense, Deferred Financing Costs | 1.3 | 1.4
Deferred tax liabilities, net | (1,107.2) | (1,273.0)
Net deferred tax liabilities | $ (973.3) | $ (1,159.4)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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