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Balance sheet components - Other non-current assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020
Convertible note receivable | $ 3,021 |
Other non-current assets | 4,653 | $ 2,823
Other non-current assets | 7,674 | $ 2,823
Convertible note receivable |  |
Maximum loan offered to borrower | $ 3,000 |
Interest rate on promissory note | 4.00% |

X
- Definition Amount of receivable from parties in nontrade transactions and is convertible to the borrowers shares of stocks, per agreement. + References No definition available. + Details
Name: | twst_ConvertibleNoteReceivable
Namespace Prefix: | twst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of interest rate on promissory notes. + References No definition available. + Details
Name: | twst_InterestRateOnPromissoryNote
Namespace Prefix: | twst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of maximum loan offered to borrower. + References No definition available. + Details
Name: | twst_MaximumLoanOfferedToBorrower
Namespace Prefix: | twst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of noncurrent assets classified as other, excluding converible receivable. + References No definition available. + Details
Name: | twst_OtherAssetsNoncurrentExcludingConvertibleReceivable
Namespace Prefix: | twst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of noncurrent assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_InvestmentTypeAxis=twst_ConvertiblePromissoryNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |