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Warrants - (Detail) - $ / shares			1 Months Ended
	Mar. 28, 2016	Dec. 22, 2015	Nov. 30, 2020	Oct. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Warrant or Right [Line Items]
Class of warrants or rights outstanding						26,385
Number of warrants exercised			7,531	18,854
Exercise price per share			$ 21.24	$ 14.85
Common stock issued for cashless exercise			6,041	16,051
Warrants One [Member]
Class of Warrant or Right [Line Items]
Class of warrants or rights number of warrants issued during the period	7,531	18,854
Class of warrants or rights outstanding					0

X

- Definition

Class of warrants or rights number of warrants issued during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	twst_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number of common stock issued in exchange for share options (or share units) exercised via net exercise (cashless) method during the current period.

+ References

No definition available.

+ Details

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Namespace Prefix:	twst_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number stock warrants exercise during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	twst_
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Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Period Type:	instant

X

- 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.

+ Details

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X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- Details

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Period Type: