v3.25.2
Shareholder Report
 6 Months Ended
Jul. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Dreyfus Treasury Obligations Cash Management
Entity Central Index Key 0000796251
Entity Investment Company Type N-1A
Document Period End Date Jul. 31, 2025
C000000251 [Member]  
Shareholder Report [Line Items]  
Fund Name Dreyfus Treasury Obligations Cash Management
Class Name Institutional Shares
Trading Symbol DTRXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Dreyfus Treasury Obligations Cash Management (the “Fund”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.dreyfus.com/products/mm.html#overview. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website www.dreyfus.com/products/mm.html#overview
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares* $9 0.17%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 9 [1]
Expense Ratio, Percent 0.17% [1],[2]
Net Assets $ 47,682,000,000
Holdings Count | Holding 73
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 7/31/25 )

Fund Size (Millions)
Number of Holdings
$47,682 73
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 7/31/25 )
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000000252 [Member]  
Shareholder Report [Line Items]  
Fund Name Dreyfus Treasury Obligations Cash Management
Class Name Investor Shares
Trading Symbol DTVXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Dreyfus Treasury Obligations Cash Management (the “Fund”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.dreyfus.com/products/mm.html#overview. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website www.dreyfus.com/products/mm.html#overview
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares* $21 0.42%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 21 [3]
Expense Ratio, Percent 0.42% [3],[4]
Net Assets $ 47,682,000,000
Holdings Count | Holding 73
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 7/31/25 )

Fund Size (Millions)
Number of Holdings
$47,682 73
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 7/31/25 )
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000000253 [Member]  
Shareholder Report [Line Items]  
Fund Name Dreyfus Treasury Obligations Cash Management
Class Name Administrative Shares
Trading Symbol DTAXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Dreyfus Treasury Obligations Cash Management (the “Fund”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.dreyfus.com/products/mm.html#overview. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website www.dreyfus.com/products/mm.html#overview
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Administrative Shares* $14 0.28%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 14 [5]
Expense Ratio, Percent 0.28% [5],[6]
Net Assets $ 47,682,000,000
Holdings Count | Holding 73
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 7/31/25 )

Fund Size (Millions)
Number of Holdings
$47,682 73
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 7/31/25 )
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000000254 [Member]  
Shareholder Report [Line Items]  
Fund Name Dreyfus Treasury Obligations Cash Management
Class Name Participant Shares
Trading Symbol DTPXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Dreyfus Treasury Obligations Cash Management (the “Fund”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.dreyfus.com/products/mm.html#overview. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website www.dreyfus.com/products/mm.html#overview
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Participant Shares* $29 0.57%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 29 [7]
Expense Ratio, Percent 0.57% [7],[8]
Net Assets $ 47,682,000,000
Holdings Count | Holding 73
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 7/31/25 )

Fund Size (Millions)
Number of Holdings
$47,682 73
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 7/31/25 )
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000223304 [Member]  
Shareholder Report [Line Items]  
Fund Name Dreyfus Treasury Obligations Cash Management
Class Name Wealth Shares
Trading Symbol DTKXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Dreyfus Treasury Obligations Cash Management (the “Fund”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.dreyfus.com/products/mm.html#overview. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website www.dreyfus.com/products/mm.html#overview
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Wealth Shares* $21 0.42%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 21 [9]
Expense Ratio, Percent 0.42% [9],[10]
Net Assets $ 47,682,000,000
Holdings Count | Holding 73
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 7/31/25 )

Fund Size (Millions)
Number of Holdings
$47,682 73
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 7/31/25 )
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
C000223303 [Member]  
Shareholder Report [Line Items]  
Fund Name Dreyfus Treasury Obligations Cash Management
Class Name Service Shares
Trading Symbol DTNXX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Dreyfus Treasury Obligations Cash Management (the “Fund”) for the period of February 1, 2025 to July 31, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.dreyfus.com/products/mm.html#overview. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com.
Additional Information Phone Number 1-800-373-9387
Additional Information Email info@bny.com
Additional Information Website www.dreyfus.com/products/mm.html#overview
Expenses [Text Block]
What were the Fund’s costs for the last six months ?
(based on a hypothetical $10,000 investment)
Share Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Service Shares* $49 0.98%**
*
During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
**
Annualized.
Expenses Paid, Amount $ 49 [11]
Expense Ratio, Percent 0.98% [11],[12]
Net Assets $ 47,682,000,000
Holdings Count | Holding 73
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (AS OF 7/31/25 )

Fund Size (Millions)
Number of Holdings
$47,682 73
Not FDIC Insured. Not Bank-Guaranteed. May Lose Value
Holdings [Text Block]
Portfolio Holdings (as of 7/31/25 )
Allocation of Holdings (Based on Net Assets)
Graphical Representation - Top N Holdings Chart
[1] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[2] Annualized.
[3] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[4] Annualized.
[5] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[6] Annualized.
[7] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[8] Annualized.
[9] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[10] Annualized.
[11] During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. If this agreement is not extended in the future, expenses could be higher.
[12] Annualized.