"good thing" meaning in English

{
  "etymology_text": ": good thing < → δείτε τις λέξεις good και thing",
  "forms": [
    {
      "form": "good thing"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ιδιωματισμοί (αγγλικά)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "They stole the suitcase from me, good thing that I didn’t have my papers inside.",
          "translation": "Μου έκλεψαν τη βαλίτσα, πάλι καλά που δεν είχα τα χαρτιά μου μέσα."
        }
      ],
      "glosses": [
        "πάλι καλά"
      ],
      "id": "el-good_thing-en-phrase-o0KQjPgJ",
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "good thing"
}

{
  "etymology_text": ": good thing < → δείτε τις λέξεις good και thing",
  "forms": [
    {
      "form": "good thing"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Ιδιωματισμοί (αγγλικά)"
      ],
      "examples": [
        {
          "text": "They stole the suitcase from me, good thing that I didn’t have my papers inside.",
          "translation": "Μου έκλεψαν τη βαλίτσα, πάλι καλά που δεν είχα τα χαρτιά μου μέσα."
        }
      ],
      "glosses": [
        "πάλι καλά"
      ],
      "raw_tags": [
        "ιδιωματισμός"
      ]
    }
  ],
  "word": "good thing"
}