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Debt - Senior Secured Term Loan Credit Facility - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 27, 2019 | Feb. 01, 2019 | Sep. 30, 2016 | Sep. 30, 2020 | Dec. 31, 2019 | Apr. 03, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, prepaid principal amount |  |  |  | $ 575.0 |  |
2016 Term Loan Facility [Member] | Repricing Amendment [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 4.00% |  |
2016 Term Loan Facility [Member] | Repricing Amendment [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 1.75% |  |
2016 Term Loan Facility [Member] | Repricing Amendment [Member] | LIBOR Floor Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 0.75% |  |
2016 Term Loan Facility [Member] | Incremental Term Loan Facility | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 2.00% | 1.75% |
LIBOR floor rate |  |  |  | 1.00% | 0.75% |
Newport Corporation | Secured Debt [Member] | Floor Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 0.00% |  |
Newport Corporation | Secured Debt [Member] | Base Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 0.75% |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured term loan, face amount |  |  |  | $ 780.0 |  |
Term loan maturity date |  |  |  | Apr. 29, 2023 |  |
Debt instrument, interest rate terms |  |  |  | borrowings under the Term Loan Facility​​​​​​​ bear interest per annum at one of the following rates selected by the Company: (a) a base rate determined by reference to the highest of (1) the federal funds effective rate plus 0.50%, (2) the “prime rate” quoted in The Wall Street Journal, (3) a London Interbank Offer Rate (“LIBOR”) rate determined by reference to the costs of funds for U.S. dollar deposits for an interest period of one month adjusted for certain additional costs, plus 1.00%, and (4) a floor of 1.75%, plus, in each case, an applicable margin; or (b) a LIBOR rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, subject to a LIBOR rate floor of 0.0%, plus an applicable margin. The Company has elected the interest rate as described in clause (b) of the foregoing sentence. The Term Loan Credit Agreement provides that, unless an alternate rate of interest is agreed, all loans will be determined by reference to the base rate if the LIBOR rate cannot be ascertained, if regulators impose material restrictions on the authority of a lender to make LIBOR rate loans, or for other reasons. The 2016 Term Loan Facility was issued with original issue discount of 1.00​​​​​​​% of the principal amount thereof. |  |
Debt instrument, interest rate |  |  |  | 0.00% |  |
Debt instrument, issue discount percentage on principal |  |  |  | 1.00% |  |
Deferred finance fees, original issue discount and re-pricing fee, gross |  |  |  | $ 28.7 |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Interest Rate Hedge [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, maturity date |  |  | Sep. 30, 2020 |  |  |
Interest rate swap agreement, notional amount |  |  | $ 335.0 |  |  |
Interest rate swap agreement, interest rate |  |  | 1.198% |  |  |
Interest rate swap agreement, credit spread rate |  |  |  | 1.75% |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Federal Funds Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 0.50% |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Adjusted One Month LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 1.00% |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Floor Rate [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 1.75% |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Incremental Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Deferred finance fees, original issue discount and re-pricing fee, gross |  |  |  | $ 11.4 |  |
Newport Corporation | 2016 Term Loan Facility [Member] | Secured Debt Repricing Amendment One | Interest Rate Hedge [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate swap agreement, notional amount |  |  |  |  | $ 250.0 |
Interest rate swap agreement, interest rate |  |  | 1.198% |  |  |
Interest rate swap agreement, credit spread rate |  |  |  | 1.75% |  |
Newport Corporation | Incremental Term Loan Facility | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate terms |  |  |  | The 2019 Term Loan Refinancing Facility matures on February 2, 2026, and bears interest at a rate per annum equal to, at the Company’s option, a base rate or LIBOR rate (as described above) plus, in each case, an applicable margin equal to 0.75% with respect to base rate borrowings and 1.75% with respect to LIBOR borrowings. The 2019 Term Loan Refinancing Facility was issued with original issue discount of 0.25% of the principal amount thereof. |  |
Debt instrument, prepaid principal amount | $ 50.0 |  |  |  |  |
Newport Corporation | Incremental Term Loan Facility | Secured Debt Repricing Amendment One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured term loan, face amount |  |  |  | $ 835.6 |  |
Term loan maturity date |  |  |  | Feb. 02, 2026 |  |
Debt instrument, interest rate |  |  |  | 1.90% |  |
Debt instrument, prepaid principal amount |  |  |  | $ 19.4 |  |
Debt instrument, frequency of periodic payment |  |  |  | quarterly |  |
Debt instrument, periodic payment percentage |  |  |  | 0.25% |  |
Newport Corporation | Incremental Term Loan Facility | Secured Debt Repricing Amendment One | Interest Rate Hedge [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate swap agreement, notional amount |  |  |  | $ 300.0 | 300.0 | $ 300.0
Interest rate swap agreement, interest rate |  |  |  |  |  | 2.309%
Interest rate swap agreement, credit spread rate |  |  |  | 1.75% |  |
Newport Corporation | 2019 Term Loan Refinancing Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Deferred finance fees, original issue discount and re-pricing fee, gross |  |  |  | $ 9.8 | $ 2.2 |
Newport Corporation | 2019 Term Loan Refinancing Facility [Member] | LIBOR [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 1.75% |  |
Newport Corporation | 2019 Term Loan Refinancing Facility [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured term loan, face amount | $ 896.8 |  |  |  |  |
Term loan maturity date |  |  |  | Feb. 02, 2026 |  |
Debt instrument, issue discount percentage on principal |  |  |  | 0.25% |  |
Electro Scientific Industries Inc [Member] | 2016 Term Loan Facility [Member] | Secured Debt [Member] | Interest Rate Hedge [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan maturity date |  |  |  |  |  | Mar. 31, 2023
Interest rate swap agreement, notional amount |  |  |  | $ 300.0 |  | $ 300.0
Interest rate swap agreement, interest rate |  |  |  |  |  | 2.309%
Interest rate swap agreement, credit spread rate |  |  |  | 1.75% |  |
Interest rate swap agreement, fair value liability |  |  |  | $ 14.0 |  |
Electro Scientific Industries Inc [Member] | Incremental Term Loan Facility | Definitive Merger Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term loan maturity date |  | Feb. 01, 2026 |  |  |  |
Debt instrument, interest rate terms |  | Prior to the effectiveness of Amendment No. 6 (as defined below), the 2019 Incremental Term Loan Facility had a maturity date of February 1, 2026 and bore interest at a rate per annum equal to, at the Company’s option, a base rate or LIBOR rate (as described above) plus, in each case, an applicable margin equal to 1.25% with respect to base rate borrowings and 2.25% with respect to LIBOR borrowings. |  |  |  |
Debt instrument, issue discount percentage on principal |  | 1.00% |  |  |  |
Electro Scientific Industries Inc [Member] | Incremental Term Loan Facility | Maximum [Member] | Definitive Merger Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Business acquisition, term loan debt financing |  | $ 650.0 |  |  |  |
Electro Scientific Industries Inc [Member] | Incremental Term Loan Facility | LIBOR [Member] | Definitive Merger Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 2.25% |  |  |  |
Electro Scientific Industries Inc [Member] | Incremental Term Loan Facility | Base Rate [Member] | Definitive Merger Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 1.25% |  |  |  |

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