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Defined Benefit Pension Plan (Tables)

12 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of net periodic benefit cost recognized

The net periodic benefit cost is recognized within Interest and other income, net in the Consolidated Statements of Operations, and for the years ended September 30, 2021, 2020 and 2019, included the following components:

						Year Ended September 30,
						2021						2020						2019
						(in thousands)
Interest cost						$	438					$	431					$	618
Expected return on plan assets						(793)						(797)						(965)
Amortization of prior service cost						21						19						—
Total net periodic benefit						$	(334)					$	(347)					$	(347)

Schedule of reconciliation of benefit obligations, plan assets, and funded status related to qualified defined benefit pension plan

The following table provides a reconciliation of benefit obligations, plan assets, and funded status related to the Company's qualified defined benefit pension plan for the years ended September 30, 2021 and 2020:

						Year Ended September 30,
						2021						2020
						(in thousands)
Change in benefit obligation
Beginning balance						$	26,047					$	23,240
Interest cost						438						431
Benefits paid						(781)						(597)
Actuarial loss/(gain)						152						1,803
Foreign currency exchange rate changes						1,099						1,170
Ending balance						$	26,955					$	26,047

						Year Ended September 30,
						2021						2020
						(in thousands)
Change in plan assets
Beginning balance at fair value						$	26,771					$	25,779
Actual return on plan assets						1,077						297
Benefits paid						(781)						(597)
Foreign currency exchange rate changes						1,141						1,292
Ending balance at fair value						$	28,208					$	26,771
Overfunded status of the Scheme						$	1,253					$	724

Schedule of amount recognized in other comprehensive loss related to qualified defined benefit pension plan, net of tax

The amounts recognized in other comprehensive (income) loss related to the Company's qualified defined benefit pension plan, net of taxes, and the related foreign currency translation adjustments, for the years ended September 30, 2021 and 2020, is shown in the following table:

						Year Ended September 30,
						2021						2020
						(in thousands)
Accumulated other comprehensive (loss) income at beginning of year						$	(1,971)					$	303
Net actuarial gain (loss)						170						(2,293)
Foreign currency translation adjustments						(84)						19
Accumulated other comprehensive loss at end of year						$	(1,885)					$	(1,971)

Schedule of actuarial assumptions used to determine (benefit) obligations and net periodic benefit cost

The actuarial assumptions used to determine the benefit obligations at September 30, 2021 and 2020, and to determine the net periodic (benefit) cost for the year were as follows:

						September 30, 2021						September 30, 2020
Discount rate to determine net periodic (benefit) cost						1.60		%				1.80		%
Expected return on plan assets						2.82		%				3.00		%
Discount rate to determine benefit obligations						2.00		%				1.60		%
Rate of increases to deferred CPI linked benefits						3.10		%				2.50		%
Rate of increases to deferred RPI linked benefits						3.60		%				3.00		%

Schedule of expected benefit payments to participants

The Company's pension plan expects to make the following benefit payments to participants over the next 10 years:

						Pension Benefits
						(in thousands)
Year ending September 30,
2022						$	904
2023						789
2024						1,213
2025						1,052
2027						1,010
2027 through 2030						4,390
Total						$	9,358

Schedule of allocation of plan assets

The assets consisted of the following as of September 30, 2021 and 2020:

						2021						2020
Equity securities						21.0		%				20.6		%
Corporate bonds						53.0		%				53.0		%
Diversified fund						26.0		%				26.0		%
Cash						—		%				0.4		%
Total						100.0		%				100.0		%

Schedule of fair value of assets of qualified defined benefit pension plan by asset category and level within fair value hierarchy

The following table presents the fair value of the assets of the Company's qualified defined benefit pension plan by asset category and their level within the fair value hierarchy.

Balance as of September 30, 2021						Level 1						Level 2						Level 3						Total
						(in thousands)
Equity securities						$	—					$	5,860					$	—					$	5,860
Corporate bonds						—						14,878						—						14,878
Diversified fund						—						7,279						—						7,279
Cash						191						—						—						191
Total						$	191					$	28,017					$	—					$	28,208

Balance as of September 30, 2020						Level 1						Level 2						Level 3						Total
						(in thousands)
Equity securities						$	—					$	5,526					$	—					$	5,526
Corporate bonds						—						14,194						—						14,194
Diversified fund						—						6,957						—						6,957
Cash						94						—						—						94
Total						$	94					$	26,677					$	—					$	26,771

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