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Debt instrument pre payment premium percentage.

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Debt issuance costs capitalized.

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LIBOR floor rate.

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Line of credit facility contractual term.

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Percentage of borrowing base.

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Percentage of net book value of eligible inventory.

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Face (par) amount of debt instrument at time of issuance.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fixed interest rate related to the interest rate derivative.

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Nominal or face amount used to calculate payment on derivative.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Debt - Additional Information (Detail) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Feb. 01, 2019	Sep. 30, 2016	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Sep. 27, 2019	Apr. 03, 2019
Debt Instrument [Line Items]
Debt instrument, prepaid principal amount			$ 525,000,000		$ 525,000,000
Term loan maturity date			Feb. 02, 2026		Feb. 02, 2026				Mar. 31, 2023
Interest expense			$ 13,542,000	$ 3,719,000	$ 35,335,000	$ 13,071,000
Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, maturity date		Sep. 30, 2020
Interest rate swap agreement, notional amount			250,000,000		250,000,000		$ 290,000,000
Interest rate swap agreement, credit spread rate		1.75%
Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			$ 11,581,000		$ 11,581,000
Revolving Lines of Credit [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Line of credit base interest rate					1.24%
2016 Term Loan Facility [Member] \| Repricing Amendment [Member]
Debt Instrument [Line Items]
Number of repricing amendments					4
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 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					4.00%
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] \| 2019 Incremental Term Loan Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					2.00%		1.75%
LIBOR floor rate			1.00%		1.00%		0.75%
2016 Term Loan Facility [Member] \| 2019 Incremental Term Loan Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.00%		0.75%
Newport [Member] \| Secured Debt [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.75%
Newport [Member] \| Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			$ 21,308,000		$ 21,308,000
Total borrowings outstanding			3,655,000		3,655,000		$ 3,389,000
Newport [Member] \| Asset Based Credit Agreement [Member]
Debt Instrument [Line Items]
Debt issuance cost capitalized			$ 785,000		$ 785,000
Contractual term					5 years
Capitalized debt issuance cost					$ 216,000
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate terms					Borrowings under the ABL Facility bear interest at a rate per annum equal to, at the Company’s option, any of the following, plus, in each case, an applicable margin: (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 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 0.00%; and (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, with a floor of 0.00%. The initial applicable margin for borrowings under the ABL Facility is 0.50% with respect to base rate borrowings and 1.50% with respect to LIBOR borrowings.
Debt instrument, interest rate					0.50%
Percentage of borrowing based on eligible accounts					85.00%
Percentage of net book value of eligible inventory					20.00%
Percentage of borrowing based on lower of cost or market value of certain eligible inventory					65.00%
Percentage of borrowing based on net orderly liquidation value of certain eligible inventory					85.00%
Percentage of borrowing base			30.00%		30.00%
Initial commitment fee percentage					0.25%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.50%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Adjusted One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.00%
Period of Libor measurement					1 month
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| Interest Rate Floor [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.00%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Secured Debt [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.50%
Newport [Member] \| Asset Based Credit Agreement [Member] \| Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			$ 100,000,000		$ 100,000,000
Newport [Member] \| Asset Based Credit Agreement [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity in the form of letters of credit			25,000,000		25,000,000
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			780,000,000		$ 780,000,000
Debt instrument, interest rate terms					As of September 30, 2019, 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 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). The 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, issue discount percentage on principal					1.00%
Debt instrument, maturity date					Apr. 29, 2023
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.50%
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt [Member] \| Adjusted One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.00%
Period of Libor measurement					1 month
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt [Member] \| Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.75%
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt [Member] \| LIBOR Floor Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					0.00%
Newport [Member] \| 2016 Term Loan Facility [Member] \| 2019 Incremental Term Loan Facility [Member]
Debt Instrument [Line Items]
Deferred finance fees, original issue discount and re-pricing fee, gross			11,362,000		$ 11,362,000
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt Repricing Amendment 2 [Member] \| Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, notional amount			$ 300,000,000		$ 300,000,000				$ 300,000,000
Interest rate swap agreement, interest rate									2.309%
Interest rate swap agreement, credit spread rate			1.75%		1.75%
Interest rate swap agreement, fair value			$ 8,088,000		$ 8,088,000
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt Repricing Amendment 1 [Member]
Debt Instrument [Line Items]
Deferred finance fees, original issue discount and re-pricing fee, gross			28,747,000		28,747,000
Newport [Member] \| 2016 Term Loan Facility [Member] \| Secured Debt Repricing Amendment 1 [Member] \| Interest Rate Hedge [Member]
Debt Instrument [Line Items]
Interest rate swap agreement, notional amount		$ 335,000,000	$ 300,000,000		$ 300,000,000				$ 300,000,000
Interest rate swap agreement, interest rate		1.198%							2.309%
Interest rate swap agreement, credit spread rate			1.75%		1.75%
Interest rate swap agreement, fair value			$ 1,180,000		$ 1,180,000
Newport [Member] \| 2019 Incremental Term Loan Facility [Member] \| Secured Debt Repricing Amendment 1 [Member]
Debt Instrument [Line Items]
Secured term loan, face amount			$ 894,597,000		$ 894,597,000
Debt instrument, interest rate					3.59%
Debt instrument, prepaid principal amount					$ 10,403,000
Term loan maturity date			Feb. 02, 2026		Feb. 02, 2026
Debt instrument, pre-payment premium percentage			1.00%		1.00%
Newport [Member] \| 2019 Incremental Term Loan Facility [Member] \| Secured Debt Repricing Amendment 1 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, quarterly payment percentage					0.25
Newport [Member] \| 2019 Term Loan Refinancing Facility [Member]
Debt Instrument [Line Items]
Deferred finance fees, original issue discount and re-pricing fee, gross			$ 12,258,000		$ 12,258,000
Newport [Member] \| 2019 Term Loan Refinancing Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					1.75%
Newport [Member] \| 2019 Term Loan Refinancing Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Secured term loan, face amount								$ 896,839,000
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, issue discount percentage on principal					0.25%
Debt instrument, prepaid principal amount								$ 50,000,000
Electro Scientific Industries Inc [Member] \| 2019 Incremental Term Loan Facility [Member] \| Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, issue discount percentage on principal	1.00%
Electro Scientific Industries Inc [Member] \| 2019 Incremental Term Loan Facility [Member] \| Maximum [Member] \| Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Business acquisition, term loan debt financing	$ 650,000,000
Electro Scientific Industries Inc [Member] \| 2019 Incremental Term Loan Facility [Member] \| Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
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.
Term loan maturity date	Feb. 01, 2026
Electro Scientific Industries Inc [Member] \| 2019 Incremental Term Loan Facility [Member] \| LIBOR [Member] \| Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.25%
Electro Scientific Industries Inc [Member] \| 2019 Incremental Term Loan Facility [Member] \| Base Rate [Member] \| Definitive Merger Agreement[Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.25%