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Stockholders' Equity and Stock-Based Compensation - Stock-Based Compensation Expense in Consolidated Statement of Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 25, 2021 | Sep. 26, 2020 | Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 65.0 | $ 83.3 | $ 62.0
Cost of revenues |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 8.0 | 6.7 | 7.1
Research and development |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 7.7 | 8.0 | 9.2
Selling and marketing |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 9.5 | 10.2 | 10.2
General and Administrative Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 38.9 | 50.9 | 35.5
Restructuring Charges |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 0.9 | $ 7.5 | $ 0.0

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