0000055135 2026-05-07 2026-05-07 0000055135 us-gaap:CommonClassAMember 2026-05-07 2026-05-07 0000055135 us-gaap:CommonClassBMember 2026-05-07 2026-05-07 KELLY SERVICES INC --01-03 false 0000055135 8-K 2026-05-07 DE 000-01088 38-1510762 999 WEST BIG BEAVER ROAD TROY MI 48084 248 362-4444 false false false false Class A Common Stock, $1.00 par value per share KELYA NASDAQ Class B Common Stock, $1.00 par value per share KELYB NASDAQ false