Shareholder Report |
6 Months Ended |
|---|---|
|
Apr. 30, 2026
USD ($)
Holding
| |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Janus Detroit Street Trust |
| Entity Central Index Key | 0001500604 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Apr. 30, 2026 |
| C000165025 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Small/Mid Cap Growth Alpha ETF |
| Class Name | ETF |
| Trading Symbol | JSMD |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Small/Mid Cap Growth Alpha ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 14 |
| Expense Ratio, Percent | 0.28% |
| AssetsNet | $ 980,000,000 |
| Holdings Count | Holding | 123 |
| InvestmentCompanyPortfolioTurnover | 101.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000165024 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Small Cap Growth Alpha ETF |
| Class Name | ETF |
| Trading Symbol | JSML |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Small Cap Growth Alpha ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 16 |
| Expense Ratio, Percent | 0.30% |
| AssetsNet | $ 316,000,000 |
| Holdings Count | Holding | 121 |
| InvestmentCompanyPortfolioTurnover | 101.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000173876 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Short Duration Income ETF |
| Class Name | ETF |
| Trading Symbol | VNLA |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Short Duration Income ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 11 |
| Expense Ratio, Percent | 0.22% |
| AssetsNet | $ 3,233,000,000 |
| Holdings Count | Holding | 329 |
| InvestmentCompanyPortfolioTurnover | 26.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000204446 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Mortgage-Backed Securities ETF |
| Class Name | ETF |
| Trading Symbol | JMBS |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Mortgage-Backed Securities ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 10 |
| Expense Ratio, Percent | 0.21% |
| AssetsNet | $ 6,617,000,000 |
| Holdings Count | Holding | 637 |
| InvestmentCompanyPortfolioTurnover | 55.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000222294 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson AAA CLO ETF |
| Class Name | ETF |
| Trading Symbol | JAAA |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson AAA CLO ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 10 |
| Expense Ratio, Percent | 0.20% |
| AssetsNet | $ 27,099,000,000 |
| Holdings Count | Holding | 600 |
| InvestmentCompanyPortfolioTurnover | 49.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000227173 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson U.S. Real Estate ETF |
| Class Name | ETF |
| Trading Symbol | JRE |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson U.S. Real Estate ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 35 |
| Expense Ratio, Percent | 0.65% |
| AssetsNet | $ 4,000,000 |
| Holdings Count | Holding | 26 |
| InvestmentCompanyPortfolioTurnover | 38.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000230327 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Corporate Bond ETF |
| Class Name | ETF |
| Trading Symbol | JLQD |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Corporate Bond ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.19% |
| AssetsNet | $ 25,000,000 |
| Holdings Count | Holding | 145 |
| InvestmentCompanyPortfolioTurnover | 117.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000232781 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson B-BBB CLO ETF |
| Class Name | ETF |
| Trading Symbol | JBBB |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson B-BBB CLO ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.46% |
| AssetsNet | $ 1,144,000,000 |
| Holdings Count | Holding | 195 |
| InvestmentCompanyPortfolioTurnover | 36.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000246278 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Securitized Income ETF |
| Class Name | ETF |
| Trading Symbol | JSI |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Securitized Income ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 26 |
| Expense Ratio, Percent | 0.51% |
| AssetsNet | $ 1,515,000,000 |
| Holdings Count | Holding | 559 |
| InvestmentCompanyPortfolioTurnover | 34.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000251866 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Emerging Markets Debt Hard Currency ETF |
| Class Name | ETF |
| Trading Symbol | JEMB |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Emerging Markets Debt Hard Currency ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 26 |
| Expense Ratio, Percent | 0.52% |
| AssetsNet | $ 478,000,000 |
| Holdings Count | Holding | 316 |
| InvestmentCompanyPortfolioTurnover | 21.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000253667 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Mid Cap Growth Alpha ETF |
| Class Name | ETF |
| Trading Symbol | JMID |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Mid Cap Growth Alpha ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.30% |
| AssetsNet | $ 18,000,000 |
| Holdings Count | Holding | 83 |
| InvestmentCompanyPortfolioTurnover | 112.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000255137 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Income ETF |
| Class Name | ETF |
| Trading Symbol | JIII |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Income ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 26 |
| Expense Ratio, Percent | 0.51% |
| AssetsNet | $ 166,000,000 |
| Holdings Count | Holding | 425 |
| InvestmentCompanyPortfolioTurnover | 50.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000256831 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Transformational Growth ETF |
| Class Name | ETF |
| Trading Symbol | JXX |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Transformational Growth ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.57% |
| AssetsNet | $ 36,000,000 |
| Holdings Count | Holding | 26 |
| InvestmentCompanyPortfolioTurnover | 20.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000262100 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Asset-Backed Securities ETF |
| Class Name | ETF |
| Trading Symbol | JABS |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Asset-Backed Securities ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.33% |
| AssetsNet | $ 131,000,000 |
| Holdings Count | Holding | 128 |
| InvestmentCompanyPortfolioTurnover | 40.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000263100 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Global Artificial Intelligence ETF |
| Class Name | ETF |
| Trading Symbol | JHAI |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Global Artificial Intelligence ETF ("Fund") for the period of November 1, 2025 to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.59% |
| AssetsNet | $ 21,000,000 |
| Holdings Count | Holding | 48 |
| InvestmentCompanyPortfolioTurnover | 28.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000270795 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson AA-A CLO ETF |
| Class Name | ETF |
| Trading Symbol | JA |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson AA-A CLO ETF ("Fund") for the period of February 18, 2026 (inception) to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.29% |
| Expenses Short Period Footnote [Text Block] | Amount shown reflects the expenses of the Fund from inception date through April 30, 2026. Expenses would be higher if the Fund had been in operations for the full period. |
| AssetsNet | $ 110,000,000 |
| Holdings Count | Holding | 35 |
| InvestmentCompanyPortfolioTurnover | 0.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000269874 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson U.S. Equity Enhanced Income ETF |
| Class Name | ETF |
| Trading Symbol | JUDO |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson U.S. Equity Enhanced Income ETF ("Fund") for the period of March 24, 2026 (inception) to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.55% |
| Expenses Short Period Footnote [Text Block] | Amount shown reflects the expenses of the Fund from inception date through April 30, 2026. Expenses would be higher if the Fund had been in operations for the full period. |
| AssetsNet | $ 7,000,000 |
| Holdings Count | Holding | 68 |
| InvestmentCompanyPortfolioTurnover | 25.00% |
| Additional Fund Statistics [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000265934 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Equity Linked High Income ETF |
| Class Name | ETF |
| Trading Symbol | JELH |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Equity Linked High Income ETF ("Fund") for the period of April 21, 2026 (inception) to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.59% |
| Expenses Short Period Footnote [Text Block] | Amount shown reflects the expenses of the Fund from inception date through April 30, 2026. Expenses would be higher if the Fund had been in operations for the full period. |
| AssetsNet | $ 11,000,000 |
| Holdings Count | Holding | 1 |
| InvestmentCompanyPortfolioTurnover | 0.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |
| C000265935 | |
| Shareholder Report [Line Items] | |
| Fund Name | Janus Henderson Equity Linked Moderate Income ETF |
| Class Name | ETF |
| Trading Symbol | JELM |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Janus Henderson Equity Linked Moderate Income ETF ("Fund") for the period of April 21, 2026 (inception) to April 30, 2026. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at janushenderson.com/info. You can also request this information by contacting us at 1-800-668-0434. |
| Additional Information Phone Number | 1-800-668-0434 |
| Additional Information Website | janushenderson.com/info |
| Expenses [Text Block] | |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.59% |
| Expenses Short Period Footnote [Text Block] | Amount shown reflects the expenses of the Fund from inception date through April 30, 2026. Expenses would be higher if the Fund had been in operations for the full period. |
| AssetsNet | $ 11,000,000 |
| Holdings Count | Holding | 1 |
| InvestmentCompanyPortfolioTurnover | 0.00% |
| Additional Fund Statistics [Text Block] | |
| Holdings [Text Block] | |
| Updated Prospectus Phone Number | 1-800-668-0434 |