v3.26.1
DWS S&P 500 Index Fund N-1A Cover
Apr. 28, 2026
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name Deutsche DWS Institutional Funds Deutsche DWS Institutional Funds
Entity Central Index Key 0000862157
Entity Investment Company Type N-1A
Document Period End Date Apr. 28, 2026
Prospectus Date May 01, 2026