S 000000113 Summary1 [Member] Prospectus Summary Prospectus Summary S 000000113 [Member] DREYFUS TREASURY SECURITIES CASH MANAGEMENT DREYFUS TREASURY SECURITIES CASH MANAGEMENT C 000000257 [Member] Administrative Shares Administrative Shares cik0000843781_PrincipalRisks2Member [Member] Principal Risks Principal Risks cik0000843781_Interestraterisk2Member [Member] · Interest rate risk · Interest rate risk cik0000843781_Liquidityrisk2Member [Member] · Liquidity risk · Liquidity risk cik0000843781_USTreasurysecuritiesrisk2Member [Member] · U.S. Treasury securities risk · U.S. Treasury securities risk cik0000843781_Marketrisk2Member [Member] · Market risk · Market risk S 000000113 Summary2 [Member] Prospectus Summary Prospectus Summary C 000000255 [Member] Institutional Shares Institutional Shares S 000000113 Summary3 [Member] Prospectus Summary Prospectus Summary C 000000256 [Member] Investor Shares Investor Shares S 000000113 Summary4 [Member] Prospectus Summary Prospectus Summary C 000000258 [Member] Participant Shares Participant Shares S 000000113 Summary5 [Member] Prospectus Summary Prospectus Summary C 000223305 [Member] Service Shares Service Shares S 000000113 Summary6 [Member] Prospectus Summary Prospectus Summary C 000260907 [Member] Token-Enabled Shares Token-Enabled Shares S 000000113 Summary7 [Member] Prospectus Summary Prospectus Summary C 000223306 [Member] Wealth Shares Wealth Shares Document [Axis] Series [Axis] Prospectus Prospectus [Table] Risk/Return: Performance Measure [Axis] Class [Axis] Before Taxes After Taxes on Distributions After Taxes on Distributions and Sales Risk [Axis] All Risks [Member] Risk Lose Money [Member] Risk Not Insured [Member] Risk Nondiversified Status [Member] Risk Not Insured Depository Institution [Member] Risk Money Market Fund Price Fluctuates [Member] Risk Money Market Fund May Impose Fees or Suspend Sales [Member] Risk Money Market Fund Sponsor May Not Provide Support [Member] Risk Money Market Fund May Not Preserve Dollar [Member] Risks [Table Text Block] Risks [Table Text Block]