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Debt - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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Apr. 11, 2018 | Jul. 06, 2017 | Dec. 14, 2016 | Sep. 30, 2016 USD ($) | Jun. 09, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) Institution | Dec. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Nov. 30, 2017 USD ($) | Aug. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Nov. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin for Term Loan Credit agreement | 1.75% | 2.25% |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Floor rate | 0.75% | 0.75% |  |  |  |  |  |  |  |  |  |  |  |
Decrease in base rate borrowings margin | 0.75% | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Description of applicable margin | On April 11, 2018, the Company entered into Amendment No. 4 (the “Repricing Amendment 4”) to the Credit Agreement by and among the Company, the Lenders and Barclays Bank PLC, as administrative agent and collateral agent for the Lenders. The Repricing Amendment 4 decreased the applicable margin for the Company’s LIBOR rate term loan under the Credit Agreement to 1.75%, with a LIBOR rate floor of 0.75%. The margin for base rate borrowings decreased to 0.75% with a base rate floor of 1.75%. The period during which a prepayment premium may be required for a Repricing Transaction was reset to six months after the effective date of the Repricing Amendment 4. | The Repricing Amendment 3 decreased the applicable margin for the Company’s term loan under the Credit Agreement to 2.25% for LIBOR rate loans when the Total Leverage Ratio (as defined in the Credit Agreement) was at or above 1.25:1 and decreased to 2.00% when the Total Leverage Ratio was below 1.25:1, both with a LIBOR floor of 0.75%. The margin for base rate borrowings decreased to 1.25% when the Total Leverage Ratio is at or above 1.25:1 and to 1.00% when the Total Leverage Ratio is below 1.25:1. |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | $ 13,071,000 | $ 23,001,000 |  |  |  |  |  |
Japan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity in the form of letters of credit |  |  |  |  |  |  | $ 35,623,000 |  |  |  |  |  |  |
Number of financial institutions for available lines of credit and borrowing arrangements | Institution |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Aggregate borrowings expire and renewed |  |  |  |  |  |  | 3 month intervals |  |  |  |  |  |  |
Total borrowings outstanding |  |  |  |  |  |  | $ 484,000 | 0 |  |  |  |  |  |
Austria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on loans payable |  |  |  |  |  |  | Semi-annually |  |  |  |  |  |  |
Maximum [Member] | Austria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan interest rate |  |  |  |  |  |  | 2.00% |  |  |  |  |  |  |
Minimum [Member] | Austria [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan interest rate |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Interest Rate Hedge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreement, maturity date |  |  |  | Sep. 30, 2020 |  |  |  |  |  |  |  |  |  |
Interest rate swap agreement, notional amount |  |  |  |  |  |  | $ 290,000,000 | 305,000,000 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 10,995,000 |  |  |  |  |  |  |
Revolving Lines of Credit [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit base interest rate |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |
Newport [Member] | Revolving Lines of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings outstanding |  |  |  |  |  |  | $ 5,040,000 | $ 2,965,000 |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan, face amount |  |  |  |  |  |  | $ 780,000,000 |  |  |  |  |  |  |
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 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 0.75%, plus an applicable margin. The Company has elected the interest rate as described in clause (b). The Credit Agreement provides that 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 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% |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |
Newport [Member] | Term Loan 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] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | Floor Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt [Member] | LIBOR Floor Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Debt instrument, pre-payment premium percentage |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
Debt instrument, pre-payment premium |  |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |
Debt instrument, prepaid principal amount |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, prepaid amount |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |
Deferred finance fees, original issue discount and re-pricing fee, gross |  |  |  |  |  |  | $ 28,747,000 |  |  |  |  |  |  |
Deferred finance fees, original issue discount and re-pricing fee, net |  |  |  |  |  |  | $ 5,581,000 |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, quarterly payment percentage |  |  |  |  |  |  | 0.25 |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] | Interest Rate Hedge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreement, maturity date |  |  |  |  |  | Sep. 30, 2020 |  |  |  |  |  |  |  |
Interest rate swap agreement, notional amount |  |  |  | $ 335,000,000 |  | $ 335,000,000 | $ 290,000,000 |  |  |  |  |  |  |
Interest rate swap agreement, interest rate |  |  |  | 1.198% |  | 1.198% |  |  |  |  |  |  |  |
Interest rate swap agreement, credit spread rate |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |
Interest rate swap agreement, fair value |  |  |  |  |  |  | $ 8,539,000 |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 1 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan, face amount |  |  |  |  |  |  | 348,464,000 |  |  |  |  |  |  |
Debt instrument, prepaid principal amount |  |  |  |  |  |  | 425,000,000 |  | $ 50,000,000 | $ 50,000,000 | $ 75,000,000 | $ 50,000,000 | $ 50,000,000 | $ 40,000,000
Debt instrument, prepaid principal amount |  |  |  |  |  |  | $ 6,536,000 |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  |  |  |  | 3.80% |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 2 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 2.75% |  |  |  |  |  |  |  |  |  |  |
Newport [Member] | Term Loan Credit Agreement [Member] | Secured Debt Repricing Amendment 2 [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |
Newport [Member] | Asset Based Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost capitalized |  |  |  |  |  |  | $ 1,201,000 |  |  |  |  |  |  |
Contractual term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan, face amount |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate terms |  |  |  |  |  |  |  | Borrowings under the ABL 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, and (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%, plus, in each case, an initial applicable margin of 0.75%; 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, plus an initial applicable margin of 1.75%. |  |  |  |  |  |
Percentage of borrowing based on eligible accounts |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Initial commitment fee percentage |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |
Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of borrowing based on book value of certain eligible accounts |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |
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] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Newport [Member] | Asset Based Credit Agreement [Member] | Secured Debt [Member] | Initial Margin Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |
Newport [Member] | Asset Based Credit Agreement [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity in the form of letters of credit |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |

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