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SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)
 9 Months Ended
Jun. 30, 2025
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
June 30,
2025		Balance at
September 30,
2024
Contract assets: Trade receivables$74,576 $65,867 
Contract assets: Unbilled revenue10,614 14,624 
Contract liabilities: Client deposits21,724 24,898 
Contract liabilities: Deferred revenue18,527 17,088
Trade receivables and contract assets, net consisted of the following:
 June 30,September 30,
2025 2024
Trade receivables$74,576 $65,867 
Unbilled revenue10,614 14,624 
Total85,190 80,491 
Less: Allowance for credit losses(6,445)(6,931)
Trade receivables and contract assets, net of allowances for credit losses$78,745 $73,560 
The composition of fees invoiced in advance is as follows:
 June 30,September 30,
2025 2024
Client deposits$21,724 $24,898 
Deferred revenue18,527 17,088 
Fees invoiced in advance$40,251 $41,986 
Schedule of Inventory
Inventories, net consisted of the following:
 June 30,September 30,
20252024
Raw materials$1,854 $1,868 
Work in progress50 61 
Finished goods4,763 4,174 
Research model inventory41,234 14,870 
Total47,901 20,973 
Less: Obsolescence reserve(2,827)(2,800)
Inventories, net$45,074 $18,173 
Schedule of Other Current Assets
Prepaid expenses and other current assets consisted of the following:
June 30,September 30,
20252024
Advances to suppliers$19,261 $36,516 
Prepaid research models4,011 4,993 
Income tax receivable1,881 2,602 
Note receivable1,226 1,280 
Insurance recovery receivable (1)10,000 — 
Other7,156 4,857 
Prepaid expenses and other current assets$43,535 $50,248 
(1) In connection with ongoing negotiations to settle the securities class action lawsuit and related derivative lawsuits, the Company booked a $10,000 insurance recovery receivable. Refer to Note 12 - Contingencies - Securities Class Action and Derivative Lawsuits for further discussion.
Schedule of Supplemental Balance Sheet information Related to Other Assets
The composition of other assets is as follows:
 June 30,September 30,
20252024
Note receivable$6,233 $6,082 
Funded status of defined benefit plan3,126 3,142 
Finance lease right-of-use assets, net2,734 652 
Other1,578 1,897 
Other assets$13,671 $11,773 
Schedule of Accrued Liabilities
Accrued expenses and other current liabilities consisted of the following:
 June 30,September 30,
2025 2024
Accrued compensation$8,802 $10,851 
Non-income taxes3,731 4,409 
Accrued interest3,531 3,017 
Current portion of long-term finance lease426 211 
Other5,124 4,730 
Resolution Agreement and Plea Agreement (1)5,000 5,000 
Settlement accrual (2)9,307 — 
Accrued expenses and other current liabilities$35,921 $28,218 
(1) Pursuant to the Resolution Agreement and Plea Agreement, the Company paid $6,500 during fiscal 2024 and $5,000 during the three months ended June 30, 2025 and expects to pay an additional $17,000 over multiple years. Further, all interest accrued on the liabilities associated with the Resolution Agreement and Plea Agreement is payable at the time of the due date of the final payment, which is June 3, 2028. Therefore, accrued interest related to the Resolution Agreement and Plea Agreement is also presented within other long-term liabilities. Beginning in October 2024, interest accrues on the entire unpaid balance of the liabilities associated with the Resolution Agreement and Plea Agreement at an annual rate of 4.18%. Accordingly, the Company has included $12,613 and $17,000 in other long-term liabilities on its condensed consolidated balance sheets as of June 30, 2025 and September 30, 2024, respectively.
(2) In connection with the ongoing negotiations to settle the securities class action lawsuit and related derivative lawsuits, the Company booked a $10,000 liability, including a $9,307 settlement accrual and $693 within accounts payable. Refer to Note 12 Contingencies - Securities Class Action and Derivative Lawsuits for for further discussion.
Schedule of Other Liabilities
The composition of other long-term liabilities is as follows:
 June 30,September 30,
20252024
Long-term client deposits$12,127 $16,966 
Long-term finance leases2,316 433 
Other510 564 
Resolution Agreement and Plea Agreement (1)12,613 17,000 
Other long-term liabilities$27,566 $34,963 
(1) Pursuant to the Resolution Agreement and Plea Agreement, the Company paid $6,500 during fiscal 2024 and $5,000 during the three months ended June 30, 2025 and expects to pay an additional $17,000 over multiple years. Further, all interest accrued on the liabilities associated with the Resolution Agreement and Plea Agreement is payable at the time of the due date of the final payment, which is June 3, 2028. Therefore, accrued interest related to the Resolution Agreement and Plea Agreement is also presented within other long-term liabilities. Beginning in October 2024, interest accrues on the entire unpaid balance of the liabilities associated with the Resolution Agreement and Plea Agreement at an annual rate of 4.18%. Accordingly, the Company has included $12,613 and $17,000 in other long-term liabilities on its condensed consolidated balance sheets as of June 30, 2025 and September 30, 2024, respectively.