SUPPLEMENTAL BALANCE SHEET INFORMATION - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Prepaid expenses and other current assets
Advances to suppliers	$ 22,107
Income tax receivable	2,639
Prepaid research models	396	$ 1,931
Other	9,741	1,198
Prepaid expenses and other current assets	$ 34,883	$ 3,129

Amount of consideration paid in advance for supplies that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Name:	us-gaap_Supplies
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant