There isn't local version of Miarmy Document because we're improving our doc everyday.
While Atlassian Confluence provides a tool allow us export the document to a PDF or Microsoft Word.
Export the document by following steps
1. Click the "..." (the upper right corner)
upper right corner the document
2. And select the "Export to PDF" or "Export to Word"
3. Then, follow the instructions of the Atlassian to export the document.