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SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)
 9 Months Ended
Jun. 30, 2024
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 (customer deposits and deferred revenue):
Balance at
June 30,
2024		Balance at
September 30,
2023
Contract assets: Trade receivables$53,737 $77,618 
Contract assets: Unbilled revenue15,910 17,211 
Contract liabilities: Customer deposits22,374 36,689 
Contract liabilities: Deferred revenue16,321 18,933
Trade receivables and contract assets, net consisted of the following:
 June 30,September 30,
2024 2023
Trade receivables$53,737 $77,618 
Unbilled revenue15,910 17,211 
Total69,647 94,829 
Less: Allowance for credit losses(5,780)(7,446)
Trade receivables and contract assets, net of allowances for credit losses$63,867 $87,383 
The composition of fees invoiced in advance is as follows:
 June 30,September 30,
2024 2023
Customer deposits$22,374 $36,689 
Deferred revenue16,321 18,933 
Fees invoiced in advance$38,695 $55,622 
Schedule of Inventory
Inventories, net consisted of the following:
 June 30,September 30,
20242023
Raw materials$2,071 $2,259 
Work in progress78 124 
Finished goods4,483 4,439 
Research Model Inventory34,866 52,524 
Total41,498 59,346 
Less: Obsolescence reserve(2,814)(3,244)
Inventories, net$38,684 $56,102 
Schedule of Other Current Assets
Prepaid expenses and other current assets consisted of the following:
June 30,September 30,
20242023
Advances to suppliers$19,949 $19,247 
Prepaid research models3,509 4,300 
Income tax receivable2,545 1,813 
Note receivable1,280 1,226 
Other4,965 6,822 
Prepaid expenses and other current assets$32,248 $33,408 
Schedule of Supplemental Balance Sheet information Related to Other Assets
The composition of other assets is as follows:
 June 30,September 30,
20242023
Long-term advances to suppliers$6,033 $3,681 
Funded status of defined benefit plan3,181 3,036 
Other4,396 3,362 
Other assets$13,610 $10,079 
Schedule of Accrued Liabilities
Accrued expenses and other current liabilities consisted of the following:
 June 30,September 30,
2024 2023
Accrued compensation$7,552 $12,966 
Non-income taxes5,268 4,596 
Accrued interest2,488 2,975 
Other7,756 5,239 
Resolution and Plea Agreements (Note 1)5,000 — 
Accrued expenses and other current liabilities$28,064 $25,776 
Schedule of Other Liabilities
The composition of other liabilities is as follows:
 June 30,September 30,
20242023
Long-term client deposits$17,000 $5,250 
Other912 1,123 
Resolution and Plea Agreements (Note 1)17,000 — 
Other liabilities$34,912 $6,373