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

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

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=121557415&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=121557415&loc=d3e14435-108349

Name:	us-gaap_LossContingencyLawsuitFilingDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Legal Matters - Additional Information (Detail) $ in Millions		6 Months Ended
	Aug. 05, 2015 Plaintiff Employee	Jun. 30, 2022	Sep. 30, 2019 USD ($)
Loss Contingencies [Line Items]
Complaint filed date		January 25, 2013
Robles Lawsuits [Member]
Loss Contingencies [Line Items]
Number of plaintiffs against HGT \| Plaintiff	63
Number of employees filed lawsuit \| Employee	5
Robles and Adame Lawsuits \| Accrued Other [Member]
Loss Contingencies [Line Items]
Claims settlement recorded in consolidated balance sheet \| $			$ 4.8