{
 "ok": true,
 "cik": "1901612",
 "ticker": null,
 "name": "Golub Capital BDC 4, Inc.",
 "filings": [
  {
   "form": "8-K",
   "filed": "2026-09-16",
   "items": [
    "3.02 Unregistered Sales of Equity Securities"
   ],
   "url": "https://www.sec.gov/Archives/edgar/data/1901612/000190161226000036/0001901612-26-000036-index.htm"
  },
  {
   "form": "10-Q",
   "filed": "2026-08-06",
   "items": [],
   "url": "https://www.sec.gov/Archives/edgar/data/1901612/000190161226000031/0001901612-26-000031-index.htm"
  },
  {
   "form": "8-K",
   "filed": "2026-08-06",
   "items": [
    "2.02 Results of Operations and Financial Condition",
    "9.01 Financial Statements and Exhibits"
   ],
   "url": "https://www.sec.gov/Archives/edgar/data/1901612/000190161226000030/0001901612-26-000030-index.htm"
  },
  {
   "form": "10-Q",
   "filed": "2026-05-07",
   "items": [],
   "url": "https://www.sec.gov/Archives/edgar/data/1901612/000190161226000020/0001901612-26-000020-index.htm"
  },
  {
   "form": "8-K",
   "filed": "2026-05-07",
   "items": [
    "2.02 Results of Operations and Financial Condition",
    "9.01 Financial Statements and Exhibits"
   ],
   "url": "https://www.sec.gov/Archives/edgar/data/1901612/000190161226000019/0001901612-26-000019-index.htm"
  },
  {
   "form": "8-K",
   "filed": "2026-03-17",
   "items": [
    "3.02 Unregistered Sales of Equity Securities"
   ],
   "url": "https://www.sec.gov/Archives/edgar/data/1901612/000190161226000012/0001901612-26-000012-index.htm"
  }
 ],
 "events12m": 10,
 "sources": {
  "facts": "https://data.sec.gov/api/xbrl/companyfacts/CIK0001901612.json",
  "filings": "https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1901612"
 },
 "license": "Figures as filed with the SEC. Card text CC BY 4.0, POPS4.",
 "notAdvice": "Reporting, not investment advice. No price targets, no buy or sell views.",
 "edgar": "🫧 Edgar looked up Golub Capital BDC 4, Inc.. Last filing: 8-K (3.02 Unregistered Sales of Equity Securities), 2026-09-16. 10 event filings (8-K) in the past twelve months.",
 "auditor": {
  "changes": [],
  "nonReliance": [],
  "restatedSince": null
 },
 "edgarette": "🔖 The filings carry no annual revenue line Edgarette can read (common for banks and insurers, which report income differently). Nothing weighed, nothing guessed."
}