The aim of the present study was to examine how Korean EFL learners differently recall and retain both decomposable and non-decomposable idioms when they are exposed to those items through enhanced input contexts. For the study, twelve target idioms (six decomposable and six non-decomposable) that have verb plus noun form were selected. As a conceptual framework, the models of idiomatic processing in comprehension, the theories and studies about the role of semantic compositionality were discussed. The results revealed that learners recalled high percentages of both types of idioms while non-decomposable idiom recall was significantly higher in both receptive and productive knowledge immediately after the enhanced contextual language input task activities. More receptive knowledge of non-decomposable idioms was yielded than decomposable ones, and no major difference was found in delayed productive retention between the two types of idioms two weeks following the task intervention. The results are inconsistent with the view of the compositional model that posits decomposable idioms have a processing advantage in comprehension over non-decomposable ones when L2 learners were exposed to language input in contexts with cloze production and enhancement ways such as bolding, L1 glossing and repetition for target idioms simultaneously.