v3.26.1
Form N-CSR Cover
6 Months Ended
Mar. 31, 2026
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Dreyfus Institutional Liquidity Funds
Entity Central Index Key 0001717375
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2026