Litigation Matters - Additional Information (Detail) - USD ($)	3 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Amount deductible from insurance coverage	$ 500,000
Litigation costs	$ 589,000	$ 749,000
Class Action Complaint One [Member]
Loss Contingencies [Line Items]
Litigation filing date	Nov. 15, 2017
Provision for litigation losses	$ 0	0
Amended Complaint [Member]
Loss Contingencies [Line Items]
Litigation filing date	Apr. 16, 2018
Class Action Complaint Two [Member]
Loss Contingencies [Line Items]
Litigation filing date	Dec. 06, 2017
Provision for litigation losses	$ 0	0
DOJ Subpoena [Member]
Loss Contingencies [Line Items]
Litigation filing date	Apr. 17, 2018
Litigation costs	$ 540,000	0
DiaSorin Inc. [Member]
Loss Contingencies [Line Items]
Litigation costs	$ 50,000	$ 730,000

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)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

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- Definition

States the date the complaint was formally filed in a court of law, in arbitration or mediation.

+ 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=82911808&loc=d3e14326-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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- Definition

Amount deductible from Insurance coverage.

+ References

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