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Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 17, 2025 USD ($) | Apr. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) Product Segment | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Credit card receivables |  |  | $ 70.5 |  |  |  | $ 70.5 |  | $ 53.1
Bad-debt expense |  |  | 0.0 | $ 0.0 |  |  | 0.1 | $ 0.3 |
Allowance for doubtful accounts |  |  | 1.8 |  |  |  | 1.8 |  | 2.5
Allowances for product returns |  |  |  |  |  |  | $ 2.0 |  | 1.8
Number of geographic regions | Segment |  |  |  |  |  |  | 5 |  |
Number of product categories | Product |  |  |  |  |  |  | 5 |  |
Other operating income |  |  | 0.0 | 5.0 |  |  | $ 4.8 | 5.0 |
Gain on extinguishment of debt |  |  |  |  |  |  | 0.0 | (10.5) |
Minority interest increase |  |  |  |  |  | $ 6.2 |  |  |
Secretariat of the federal revenue bureau of brazil [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash |  |  | 15.2 |  |  |  | 15.2 |  | $ 15.2
HBL Link Bioscience LLC [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Consideration to acquire assets |  | $ 6.5 |  |  |  |  |  |  |
Ownership interest percentage |  | 51.00% |  |  |  |  |  |  |
Link BioSciences Inc [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Cash paid |  | $ 6.5 |  |  |  |  |  |  |
Asset acquisition contingent payments |  | 0.0 |  |  |  |  |  |  |
Reduction in cash |  | 6.5 |  |  |  |  |  |  |
Assets estimated fair value at the acquisition date |  | 12.7 |  |  |  |  |  |  |
Link BioSciences Inc [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Assets estimated fair value at the acquisition date |  | 7.2 |  |  |  |  |  |  |
Link BioSciences Inc [Member] | Software [Member] | Property Plant, and Equipment [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Assets estimated fair value at the acquisition date |  | 2.5 |  |  |  |  |  |  |
Link BioSciences Inc [Member] | Manufacturing Equipment [Member] | Property Plant, and Equipment [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Assets estimated fair value at the acquisition date |  | 2.5 |  |  |  |  |  |  |
Pruvit [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Consideration to acquire assets | $ 19.0 |  |  |  |  |  |  |  |
Pruvit [Member] | Developed Technology and Software [Member] | Property Plant, and Equipment [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Consideration to acquire assets | 14.4 |  |  |  |  |  |  |  |
Customer Relationships [Member] | Link BioSciences Inc [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Assets estimated fair value at the acquisition date |  | $ 0.5 |  |  |  |  |  |  |
Customer Relationships [Member] | Pruvit [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Consideration to acquire assets | 4.3 |  |  |  |  |  |  |  |
Assembled Workforce [Member] | Pruvit [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Consideration to acquire assets | 0.3 |  |  |  |  |  |  |  |
Minimum [Member] | Contingent Milestone Payment Period [Member] | Pruvit [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Asset acquisition contingent payments | 5.0 |  |  |  |  |  |  |  |
Maximum [Member] | Contingent Milestone Payment Period [Member] | Pruvit [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Asset acquisition contingent payments | $ 25.0 |  |  |  |  |  |  |  |
Pro2col Health LLC [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Milestones period | 10 years |  |  |  |  |  |  |  |
Additional payments | $ 0.0 |  |  |  |  |  |  |  |
Pro2col Health LLC [Member] | Contingent Milestone Payments Second [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Maximum milestone contingent payments | 46.0 |  |  |  |  |  |  |  |
Pro2col Health LLC [Member] | Minimum [Member] | Contingent Milestone Payments Third [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Contingent payments | 5.0 |  |  |  |  |  |  |  |
Pro2col Health LLC [Member] | Maximum [Member] | Contingent Milestone Payments First [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Contingent payments | 2.0 |  |  |  |  |  |  |  |
Pro2col Health LLC [Member] | Maximum [Member] | Contingent Milestone Payments Second [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Contingent payments | 3.0 |  |  |  |  |  |  |  |
Pro2col Health LLC [Member] | Maximum [Member] | Contingent Milestone Payments Third [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Contingent payments | $ 15.0 |  |  |  |  |  |  |  |
2018 Credit Facility [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  | $ 2.5 |  |  |  |
2018 Credit Facility [Member] | 2025 Senior Notes [Member] | Other (Income) Expense, Net [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  | (10.5) |
China [Member] |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |
Other operating income |  |  | $ 0.0 | $ 5.0 |  |  | $ 4.8 | $ 5.0 |

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