XML 73 R57.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Long-Term (Narrative - United States) (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2018 | Nov. 07, 2016 USD ($) | Jun. 29, 2016 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  | $ 101,073,000 | $ 128,470,000 |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 195,000,000 | $ 275,000,000 |  |  |  |  |
Term loan |  | $ 30,000,000 |  |  |  |  |  |
Leverage ratio in effect for the seventh quarter of a credit agreement |  | 4.25 |  |  |  |  |  |
Leverage ratio in effect for the eighth quarter and remainder of a credit agreement |  | 3.75 |  |  |  |  |  |
EBITDA required |  |  |  |  | $ 29,000,000 |  |  | $ 18,500,000
Fixed charge coverage ratio |  |  |  |  |  | 1.00 |  |
Fixed charge coverage ratio after fifth quarter |  |  |  |  | 1.25 |  |  |
Maximum dividends, distributions, or redemptions allowed |  | $ 1,700,000 | 4,000,000 |  |  |  |  |
Loans and advances limit |  | 5,000,000 | 10,000,000 |  |  |  |  |
Maximum asset sales allowed |  | 25,000,000 | 25,000,000 |  |  |  |  |
Carryover of asset sales allowed |  | $ 15,000,000 | $ 15,000,000 |  |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.25% |  |  |  |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Base Rate | Lowest Tier | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.50% |  |  |  |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 3.25% |  |  |  |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Euro-rate | Lowest Tier | Subsequent Event |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.50% |  |  |  |  |  |  |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Forecasted |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
EBITDA required for seventh quarter |  |  |  | $ 31,000,000 |  |  |  |
Liquidity covenant |  |  |  |  |  |  | $ 25,000,000 |
PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company | Revolving Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  | $ 425,000 |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  | $ 68,502,000 |  |  |

X
- Definition Maximum carryover amount of asset sales to future periods when the maximum asset sales allowed under a loan agreement is not reached. + References No definition available. + Details
Name: | fstr_CarryoverOfAssetSalesAllowed
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA) required. + References No definition available. + Details
Name: | fstr_EbitdaRequired
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA) required at seventh quarter of the credit agreement. + References No definition available. + Details
Name: | fstr_EbitdaRequiredForSeventhQuarter
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Required ratio of fixed charges to the last twelve months of EBITDA. + References No definition available. + Details
Name: | fstr_FixedChargeCoverageRatio
Namespace Prefix: | fstr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Required ratio of fixed charges to the last twelve months of EBITDA after the fifth quarter of credit agreement. + References No definition available. + Details
Name: | fstr_FixedChargeCoverageRatioAfterFifthQuarter
Namespace Prefix: | fstr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Leverage ratio in effect for the seventh quarter of a credit agreement. + References No definition available. + Details
Name: | fstr_LeverageRatioInSeventhQuarter
Namespace Prefix: | fstr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Leverage ratio in effect for the eighth quarter and remainder of a credit agreement. + References No definition available. + Details
Name: | fstr_LeverageRatioThereafter
Namespace Prefix: | fstr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Required amount of undrawn availability of a debt instrument. + References No definition available. + Details
Name: | fstr_LiquidityCovenant
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Maximum amount allowed of loans and advances to non-loan parties and loans, advances, and investments by domestic loan parties to subsidiaries that are not loan parties and to foreign loan parties. + References No definition available. + Details
Name: | fstr_LoansAndAdvancesLimit
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum amount of asset sales allowed under a loan agreement. + References No definition available. + Details
Name: | fstr_MaximumAssetSalesAllowed
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of restriction on the entity's ability to pay dividends, distributions, or redemptions as required by the terms of the credit facility when funds are drawn from the facility. + References No definition available. + Details
Name: | fstr_MaximumDividendsAllowed
Namespace Prefix: | fstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LoansPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=fstr_PncBankN.a.BankOfAmericaN.a.WellsFargoBankN.a.CitizensBankOfPennsylvaniaAndBranchBankingAndTrustCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fstr_TierAxis=fstr_LowestTierMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |