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Debt - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 17, 2017 USD ($) | Sep. 26, 2017 USD ($) | May 31, 2012 USD ($) | Apr. 30, 2012 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 27, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Liquidity Position To Meet Future Obligations, Amount |  |  |  |  | $ 271,400 |  |  | $ 271,400 |  |
Interest Paid |  |  |  |  | 2,000 | $ 1,900 |  |  |  |
Interest expense |  |  |  |  | 7,044 | 3,187 |  | 21,649 | $ 9,065 |
Gains (losses) on extinguishment of debt, total |  |  |  |  |  |  |  | (174) | (767) |
Debt Instrument, Redemption, Description |  | The Senior Notes will mature on October 1, 2025. At any time prior to October 1, 2020, the Company may redeem some or all of the Senior Notes for cash at a redemption price equal to 100% of the aggregate principal amount of the Senior Notes being redeemed plus an applicable make-whole premium set forth in the indenture for the Senior Notes and accrued and unpaid interest to, but not including, the redemption date. Prior to October 1, 2020, the Company may redeem up to 40% of the Senior Notes at a redemption price of 105.50% of the principal amount, plus accrued and unpaid interest to, but not including, the redemption date, with the proceeds of certain equity offerings so long as if, after any such redemption occurs, at least 60% of the aggregate principal amount of the Senior Notes remains outstanding. On and after October 1, 2020, the Company may redeem some or all of the Senior Notes at redemption prices (expressed as percentages of principal amount) equal to 102.750% for the twelve-month period beginning on October 1, 2020, 101.375% for the twelve-month period beginning October 1, 2021 and 100% beginning on October 1, 2022, plus accrued and unpaid interest to, but not including, the redemption date. Upon the occurrence of a Change of Control (as defined in the indenture for the Senior Notes), unless the Company has exercised its optional redemption right in respect of the Senior Notes, the holders of the Senior Notes have the right to require the Company to repurchase all or a portion of the Senior Notes at a price equal to 101% of the aggregate principal amount of the Senior Notes, plus any accrued and unpaid interest to, but not including, the date of repurchase. |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  | 200 | 100 |
Term Loan Credit Agreement Principal Amount |  |  |  |  |  |  |  | 500 |  |
Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes issued, aggregate principal amount |  |  |  | $ 150,000 |  |  |  |  |  |
Notes issued, interest rate |  |  |  | 3.375% |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  | 44,600 |  |
Gains (losses) on extinguishment of debt, total |  |  |  |  |  |  |  | 200 |  |
Proceeds from Notes Payable |  |  |  | $ 145,100 |  |  |  |  |  |
Debt Instrument Convertible Conversion Amount Settled Over the Principal |  |  |  |  |  |  |  | 80,200 |  |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt |  |  |  |  |  |  |  | 35,500 |  |
Convertible Senior Notes | Walker Group Holdings LLC |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Year |  |  |  | 2018 |  |  |  |  |  |
Amended Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest Paid |  |  |  |  |  |  |  | 5,900 | $ 5,700 |
Gains (losses) on extinguishment of debt, total |  |  |  |  |  |  | $ 600 |  |  |
Term Loan Credit Agreement Principal Amount |  |  |  |  |  |  | $ 1,400 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes issued, aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 325,000
Notes issued, interest rate |  |  |  |  |  |  |  |  |  | 5.50%
Notes issued, interest payment frequency |  | The Senior Notes bear interest at the rate of 5.50% per annum from the date of issuance, and will pay interest semi-annually in cash on April 1 and October 1 of each year, beginning on April 1, 2018. |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Oct. 01, 2025 |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | 4,600 |  |  | $ 13,800 |  |
Proceeds from Issuance of Senior Long-term Debt |  | $ 318,900 |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  | Jun. 04, 2020 |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  | The Revolving Credit Facility (i) bears interest, at the Borrowers’ election, at (x) the London Interbank Offer Rate (LIBOR) (subject to a floor of 0%) plus a margin ranging from 150 basis points to 200 basis points, or (y) a base rate plus a margin ranging from 50 basis points to 100 basis points, in each case, based upon the monthly average excess availability under the Revolving Credit Facility, (ii) requires the Company to pay a monthly unused line fee equal to 25 basis points times the average unused availability under the Revolving Credit Facility, (iii) provides that if availability under the Revolving Credit Facility is less than 12.5% of the total commitment under the Revolving Credit Facility or if there exists an event of default, amounts in any of the Borrowers’ and the subsidiary guarantors’ deposit accounts (other than certain excluded accounts) will be transferred daily into a blocked account held by the Agent and applied to reduce the outstanding amounts under the Revolving Credit Facility, and (iv) requires the Company to maintain a minimum fixed charge coverage ratio of not less than 1.1 to 1.0 as of the end of any period of 12 fiscal months when excess availability under the Revolving Credit Facility is less than 10% of the total commitment under the Revolving Credit Facility. |  |
Line of Credit Facility, Borrowing Capacity, Description |  |  |  |  |  |  |  | an uncommitted accordion feature allowing for an increase to the availability under the revolving credit facility of up to $50 million, subject to certain conditions |  |
Revolving Credit Facility | Senior Secured Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notes issued, aggregate principal amount |  |  | $ 175,000 |  |  |  |  |  |  |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of tranche loan amount on equal quarterly installments | 0.25% |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  | $ 186,200 |  |  | $ 186,200 |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  | $ 1,900 |  |
Term Loan Credit Agreement | Senior Secured Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | $ 188,000 |  | $ 188,000 |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | (i) LIBOR (subject to a floor of 0%) plus a margin of 225 basis points |  |  |  |  |  |  |  |  |
Debt Instrument, Description |  |  | an uncommitted accordion feature to provide for additional senior secured term loans of up to $75 million plus an unlimited amount provided that the senior secured leverage ratio would not exceed 3.00 to 1.00, subject to certain conditions |  |  |  |  |  |  |
Term Loan Credit Agreement | Incremental Senior Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Senior Secured Leverage Ratio Covenant Requirements |  |  |  |  |  |  |  | 3.00 to 1.00 |  |
Minimum | Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fixed Charge Coverage Ratio Minimum |  |  |  |  | 1.0 |  |  | 1.0 |  |
Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  | $ 100 | $ 100 |  |  |  |
Maximum | Revolving Credit Facility | Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Fixed Charge Coverage Ratio Minimum |  |  |  |  | 1.1 |  |  | 1.1 |  |

X
- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Description of debt redemption features under terms of the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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