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Fair Value Measurements - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2020 | Mar. 28, 2020 | Dec. 28, 2019 | Mar. 30, 2019 | Mar. 31, 2018 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Investments, fair value | $ 11,200,000 |  |  |  |  | $ 11,200,000 | $ 7,700,000 |
Borrowed principal under credit agreement | 1,000,000,000.0 |  |  |  |  | 1,000,000,000.0 |  |
Impairment of intangible assets and equipment | 241,600,000 | $ 443,800,000 | $ 30,200,000 |  |  | 4,400,000 | 106,700,000 | $ 46,000,000.0
Goodwill impairment charge |  |  |  |  | $ 685,700,000 | 0 | 0 | $ 685,700,000
Impairment charge |  |  | $ 30,200,000 | $ 685,400,000 |  |  |  |
Medical Aesthetics Business |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  | $ 685,700,000 |  |  |
Medical Aesthetics Business | Acquired intangible assets [Member] |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Impairment charge |  |  |  | 675,600,000 |  |  |  |
Medical Aesthetics Business | Equipment [Member] |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Impairment charge |  |  |  | $ 9,800,000 |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Borrowed principal under credit agreement | 1,710,000,000 |  |  |  |  | 1,710,000,000 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Investments, fair value | 0 |  |  |  |  | 0 | $ 0 |
2028 Senior Notes |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Fair value of debt instrument | 419,100,000 |  |  |  |  | 419,100,000 |  |
2025 Senior Notes |  |  |  |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |  |  |  |
Fair value of debt instrument | $ 971,500,000 |  |  |  |  | $ 971,500,000 |  |

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