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Pension and Retirement Plans (Tables) | 12 Months Ended
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Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Net Benefit Costs [Table Text Block] | The components of net periodic benefit costs related to the U.S. and international plans are as follows:
| Years Ended September 30
| 2017 |  | 2016
| Foreign |  | U.S. |  | Total |  | Foreign |  | U.S. |  | Total
| (amounts in thousands)
Pension: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 41 |  |  | $ | — |  |  | $ | 41 |  |  | $ | 35 |  |  | $ | — |  |  | $ | 35 |
Interest cost | 386 |  |  | 29 |  |  | 415 |  |  | 571 |  |  | 43 |  |  | 614 |
Expected return on plan assets | (268 | ) |  | — |  |  | (268 | ) |  | (357 | ) |  | — |  |  | (357 | )
Amortization of net (gain)/loss | 370 |  |  | 4 |  |  | 374 |  |  | 174 |  |  | (5 | ) |  | 169 |
Net periodic benefit cost | $ | 529 |  |  | $ | 33 |  |  | $ | 562 |  |  | $ | 423 |  |  | $ | 38 |  |  | $ | 461 |
Post Retirement: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | 38 |  |  | $ | 38 |  |  | $ | — |  |  | $ | 27 |  |  | $ | 27 |
Interest cost | — |  |  | 44 |  |  | 44 |  |  | — |  |  | 42 |  |  | 42 |
Amortization of net (gain)/loss | — |  |  | 15 |  |  | 15 |  |  | — |  |  | (79 | ) |  | (79 | )
Net periodic benefit cost | $ | — |  |  | $ | 97 |  |  | $ | 97 |  |  | $ | — |  |  | $ | (10 | ) |  | $ | (10 | )
Pension: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ | (1,831 | ) |  | $ | (14 | ) |  | $ | (1,845 | ) |  | $ | 3,105 |  |  | $ | 25 |  |  | $ | 3,130 |
Post Retirement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | — |  |  | (99 | ) |  | (99 | ) |  | — |  |  | 283 |  |  | 283 |
Total: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in minimum liability included in comprehensive income (loss) | $ | (1,831 | ) |  | $ | (113 | ) |  | $ | (1,944 | ) |  | $ | 3,105 |  |  | $ | 308 |  |  | $ | 3,413 |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] | The following table presents an analysis of the changes in 2017 and 2016 of the benefit obligation, the plan assets and the funded status of the plans:
| Years Ended September 30
| 2017 |  | 2016
| Foreign |  | U.S. |  | Total |  | Foreign |  | U.S. |  | Total
| (Amounts in thousands)
Pension: |  |  |  |  |  |  |  |  |  |  |
Change in projected benefit obligation (“PBO”) |  |  |  |  |  |  |  |  |  |  |
Balance beginning of year | $ | 19,564 |  |  | $ | 829 |  |  | $ | 20,393 |  |  | $ | 17,979 |  |  | $ | 1,022 |  |  | $ | 19,001 |
Service cost | 42 |  |  | — |  |  | 42 |  |  | 35 |  |  | — |  |  | 35 |
Interest cost | 386 |  |  | 29 |  |  | 415 |  |  | 571 |  |  | 43 |  |  | 614 |
Changes in actuarial assumptions | (1,582 | ) |  | (9 | ) |  | (1,591 | ) |  | 3,948 |  |  | 20 |  |  | 3,968 |
Foreign exchange impact | 651 |  |  | — |  |  | 651 |  |  | (2,069 | ) |  | — |  |  | (2,069 | )
Benefits paid | (402 | ) |  | (172 | ) |  | (574 | ) |  | (900 | ) |  | (256 | ) |  | (1,156 | )
Projected benefit obligation at end of year | $ | 18,659 |  |  | $ | 677 |  |  | $ | 19,336 |  |  | $ | 19,564 |  |  | $ | 829 |  |  | $ | 20,393 |
Changes in fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 7,629 |  |  | $ | — |  |  | $ | 7,629 |  |  | $ | 9,301 |  |  | $ | — |  |  | $ | 9,301 |
Actual gain on plan assets | 368 |  |  | — |  |  | 368 |  |  | 111 |  |  | — |  |  | 111 |
Company contributions | 376 |  |  | 172 |  |  | 548 |  |  | 406 |  |  | 256 |  |  | 662 |
Foreign exchange impact | 268 |  |  | — |  |  | 268 |  |  | (1,289 | ) |  | — |  |  | (1,289 | )
Benefits paid | (402 | ) |  | (172 | ) |  | (574 | ) |  | (900 | ) |  | (256 | ) |  | (1,156 | )
Fair value of plan assets at end of year | $ | 8,239 |  |  | $ | — |  |  | $ | 8,239 |  |  | $ | 7,629 |  |  | — |  |  | $ | 7,629 |
Funded status \ net amount recognized | $ | (10,420 | ) |  | $ | (677 | ) |  | $ | (11,097 | ) |  | $ | (11,935 | ) |  | $ | (829 | ) |  | $ | (12,764 | )
Post Retirement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in projected benefit obligation (“PBO”): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance beginning of year | $ | — |  |  | $ | 1,257 |  |  | $ | 1,257 |  |  | $ | — |  |  | $ | 985 |  |  | $ | 985 |
Service cost | — |  |  | 38 |  |  | 38 |  |  | — |  |  | 27 |  |  | 27 |
Interest cost | — |  |  | 44 |  |  | 44 |  |  | — |  |  | 42 |  |  | 42 |
Changes in actuarial assumptions | — |  |  | (84 | ) |  | (84 | ) |  | — |  |  | 203 |  |  | 203 |
Projected benefit obligation at end of year | $ | — |  |  | $ | 1,255 |  |  | $ | 1,255 |  |  | $ | — |  |  | $ | 1,257 |  |  | $ | 1,257 |
Funded status \ net amount recognized | $ | — |  |  | $ | (1,255 | ) |  | $ | (1,255 | ) |  | $ | — |  |  | $ | (1,257 | ) |  | $ | (1,257 | )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | The amounts recognized in the consolidated balance sheet consist of:
| Years Ended September 30
| 2017 |  | 2016
| Foreign |  | U.S. |  | Total |  | Foreign |  | U.S. |  | Total
| (Amounts in thousands)
Pension: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued benefit liability | $ | (10,420 | ) |  | $ | (677 | ) |  | $ | (11,097 | ) |  | $ | (11,936 | ) |  | $ | (829 | ) |  | $ | (12,765 | )
Deferred tax | (493 | ) |  | 19 |  |  | (474 | ) |  | (216 | ) |  | 14 |  |  | (202 | )
Accumulated other comprehensive income | 6,893 |  |  | 18 |  |  | 6,911 |  |  | 9,001 |  |  | 26 |  |  | 9,027 |
Net amount recognized | $ | (4,020 | ) |  | $ | (640 | ) |  | $ | (4,660 | ) |  | $ | (3,151 | ) |  | $ | (789 | ) |  | $ | (3,940 | )
Post Retirement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued benefit liability | $ | — |  |  | $ | (1,255 | ) |  | $ | (1,255 | ) |  | $ | — |  |  | $ | (1,257 | ) |  | $ | (1,257 | )
Deferred tax | — |  |  | 91 |  |  | 91 |  |  | — |  |  | 52 |  |  | 52 |
Accumulated other comprehensive income (loss) | — |  |  | 38 |  |  | 38 |  |  | — |  |  | 97 |  |  | 97 |
Net amount recognized | $ | — |  |  | $ | (1,126 | ) |  | $ | (1,126 | ) |  | $ | — |  |  | $ | (1,108 | ) |  | $ | (1,108 | )
Total pension and post retirement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued benefit liability | $ | (10,420 | ) |  | $ | (1,932 | ) |  | $ | (12,352 | ) |  | $ | (11,936 | ) |  | $ | (2,086 | ) |  | $ | (14,022 | )
Deferred tax | (493 | ) |  | 110 |  |  | (383 | ) |  | (216 | ) |  | 66 |  |  | (150 | )
Accumulated other comprehensive income | 6,893 |  |  | 56 |  |  | 6,949 |  |  | 9,001 |  |  | 123 |  |  | 9,124 |
Net amount recognized | $ | (4,020 | ) |  | $ | (1,766 | ) |  | $ | (5,786 | ) |  | $ | (3,151 | ) |  | $ | (1,897 | ) |  | $ | (5,048 | )
Accumulated Benefit Obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension | $ | (18,514 | ) |  | $ | (677 | ) |  | $ | (19,191 | ) |  | $ | (19,396 | ) |  | $ | (829 | ) |  | $ | (20,225 | )
Post Retirement | — |  |  | (1,255 | ) |  | (1,255 | ) |  | — |  |  | (1,257 | ) |  | (1,257 | )
Total accumulated benefit obligation | $ | (18,514 | ) |  | $ | (1,932 | ) |  | $ | (20,446 | ) |  | $ | (19,396 | ) |  | $ | (2,086 | ) |  | $ | (21,482 | )
Schedule of Accrued Liabilities [Table Text Block] | Accrued benefit liability reported as:
| September 30,
| 2017 |  | 2016
| (Amounts in thousands)
Current accrued benefit liability | $ | 534 |  |  | $ | 581 |
Non-current accrued benefit liability | 11,818 |  |  | 13,441 |
Total accrued benefit liability | $ | 12,352 |  |  | $ | 14,022 |
Schedule of Expected Benefit Payments [Table Text Block] | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid (amounts in thousands):
Fiscal year ending September 30: |  | (Amounts in thousands)
2018 |  | $ | 606 |
2019 |  | 651 |
2020 |  | 667 |
2021 |  | 691 |
2022 |  | 724 |
Thereafter |  | 4,225 |
Schedule of Allocation of Plan Assets [Table Text Block] | The fair value of the assets held by the U.K. pension plan by asset category are as follows:
| Fair Values as of
| September 30, 2017 |  | September 30, 2016
| Fair Value Measurements Using Inputs Considered as |  | Fair Value Measurements Using Inputs Considered as
Asset Category | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
| (Thousands)
Cash on deposit | $ | 62 |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 86 |  |  | $ | 86 |  |  | $ | — |  |  | $ | — |
Pooled funds | 8,177 |  |  | 8,177 |  |  | — |  |  | — |  |  | 7,543 |  |  | 7,543 |  |  | — |  |  | — |
Total plan assets | $ | 8,239 |  |  | $ | 8,239 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,629 |  |  | $ | 7,629 |  |  | $ | — |  |  | $ | — |
Projected Benefit Obligations |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Assumptions Used [Table Text Block] | The following table provides the weighted average actuarial assumptions used to determine the actuarial present value of projected benefit obligations at:
| Domestic |  | International
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate: | 3.75 | % |  | 3.50 | % |  | 2.34 | % |  | 1.77 | %
Expected return on plan assets: |  |  |  |  | 3.70 | % |  | 3.60 | %
Rate of compensation increase: |  |  |  |  | 1.00 | % |  | 1.00 | %
Net Periodic Benefit Cost |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Assumptions Used [Table Text Block] | The following table provides the weighted average actuarial assumptions used to determine net periodic benefit cost for years ended:
| Domestic |  | International
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate: | 3.50 | % |  | 4.25 | % |  | 1.77 | % |  | 3.10 | %
Expected return on plan assets: |  |  |  |  | 3.60 | % |  | 4.20 | %
Rate of compensation increase: |  |  |  |  | 1.00 | % |  | 1.00 | %

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