Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Commitments Contingencies And Litigation [Line Items]
Annual royalty expenses	$ 1,860,000	$ 2,107,000	$ 2,579,000
2021	26,315,000
2022 - 2023	1,376,000
Thereafter	0
Payments for indemnifications	0	0
Liabilities for indemnifications	0	0
Litigation costs	2,080,000	1,583,000	4,345,000
DOJ Subpoena [Member]
Commitments Contingencies And Litigation [Line Items]
Litigation costs	$ 2,035,000	$ 1,585,000	$ 775,000
Diagnostics [Member]
Commitments Contingencies And Litigation [Line Items]
Percentage of total royalty expense	81.00%
Diagnostics [Member] \| Minimum [Member]
Commitments Contingencies And Litigation [Line Items]
Percentage of royalty payable	3.00%
Diagnostics [Member] \| Maximum [Member]
Commitments Contingencies And Litigation [Line Items]
Percentage of royalty payable	8.00%

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
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Period Type:	duration

- Definition

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

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- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ References

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308

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- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308

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- Definition

Commitments Contingencies And Litigation [Line Items]

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No definition available.

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- Definition

Percentage of royalty expense.

+ References

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- Definition

Royalty payable as percentage of commercial sales.

+ References

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- Definition

Unrecorded Unconditional Purchase Obligation Balance Due Between Two Through Five Years

+ References

No definition available.

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