SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)

12 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Contract Assets and Liabilities

The following table provides information about contract assets (trade receivables and unbilled revenue, excluding allowances for credit losses), and fees invoiced in advance (client deposits and deferred revenue):

	Balance at September 30, 2023		Balance at September 30, 2022
Contract Assets: Trade receivables	$	77,618	$	88,867
Contract Assets: Unbilled revenue	17,211		17,474
Contract liabilities: Client deposits	36,689		39,222
Contract liabilities: Deferred revenue	18,933		29,420

Trade receivables and contract assets, net consisted of the following:

	September 30, 2023		September 30, 2022
Trade receivables	$	77,618	$	88,867
Unbilled revenue	17,211		17,474
Total	94,829		106,341
Less: Allowance for credit losses	(7,446)		(6,268)
Trade receivables and contract assets, net of allowances for credit losses	$	87,383	$	100,073

The composition of fees invoiced in advance is as follows:

	September 30, 2023		September 30, 2022
Client deposits	$	36,689	$	39,222
Deferred revenue	18,933		29,420
Fees invoiced in advance	$	55,622	$	68,642

Schedule of Inventory

Inventories, net consisted of the following:

	September 30, 2023		September 30, 2022
Raw materials	$	2,259	$	1,757
Work in progress	124		186
Finished goods	4,439		4,933
Research Model Inventory	52,524		68,055
Total	59,346		74,931
Less: Obsolescence reserve	(3,244)		(3,490)
Inventories, net	$	56,102	$	71,441

Schedule of Other Current Assets

Prepaid expenses and other current assets consisted of the following:

	September 30, 2023		September 30, 2022
Advances to suppliers	$	19,247	$	30,292
Prepaid research models	4,300		3,575
Tax-related receivables	1,813		366
Note receivable	1,226		—
Other	6,822		8,250
Prepaid expenses and other current assets	$	33,408	$	42,483

Schedule of Other Assets, Noncurrent

The composition of other assets is as follows:

	September 30, 2023		September 30, 2022
Long-term advances to suppliers	$	3,681	$	2,894
Funded status of defined benefit plan	3,036		1,573
Other	3,362		3,057
Other assets	$	10,079	$	7,524

Schedule of Property, Plant and Equipment

The Company generally depreciates the cost of its property and equipment using the straight-line method over the estimated useful lives of the respective assets as follows:

Asset	Estimated Useful Lives
Land	Indefinite
Land improvements	5 - 20
Buildings and building improvements	10 - 40
Machinery and equipment	7 - 10
Furniture and fixtures	7 - 10
Computer hardware and software	3 - 5
Vehicles	3 - 5

The composition of property and equipment, net is as follows:

	September 30, 2023		September 30, 2022
Land and land improvements	$	30,710	$	20,025
Buildings and building improvements	120,932		110,572
Machinery and equipment	81,372		68,628
Furniture and fixtures	3,223		1,905
Other	3,664		—
Construction in progress	25,804		40,519
Total Cost	265,705		241,649
Accumulated depreciation	(74,637)		(55,450)
	$	191,068	$	186,199

Schedule of Accrued Liabilities

Accrued expenses consisted of the following:

	September 30, 2023		September 30, 2022
Accrued compensation	$	12,966	$	17,460
Non-income taxes	4,596		1,200
Accrued interest	2,975		5,228
Other	5,239		11,913
Accrued expenses and other liabilities	$	25,776	$	35,801