Psychological detachment from work during nonwork time has been recognized as a recovery experience that helps sustain employees’ wellbeing. While research has focused on how job stressors hinder psychological detachment, little is known about how positive work events serve as resources facilitating the detachment. Drawing on the Broaden- and-Build Theory, we investigate how positive experiences of gratitude may spread during work days and eventually foster employees to detach and recover during nonwork time. Experience sampling data (936 sets of paired data) were collected from seventy-three employees (nurses and doctors) and their spouses three times per day for four consecutive weeks (work experiences reported by employees twice per day and nonwork experiences reported by their spouses). Results support our proposed serial mediation model that receiving gratitude from others (morning) at work predicted psychological detachment at home via experienced joy (morning) and gratitude expression to others (afternoon). Such detachment benefit occurred more strongly for employees with generally higher work-to-family conflict.