One idiom could be 'the whole nine yards'. It means everything or the full extent of something. For example, 'When it comes to decorating for the party, she went the whole nine yards with balloons, streamers, and a huge cake.'
The idiom 'from soup to nuts' is also used for the full story or the whole thing. It's often used to describe a complete account or a comprehensive set of things. Like, 'The new employee training covered everything from soup to nuts, from company history to the latest software they use.'
Another idiom is 'lock, stock, and barrel'. This idiom implies the entirety of something. For instance, 'He sold his business, lock, stock, and barrel, and moved to a new city.' Here, it shows that he sold every part of his business completely.