Account Book
Register, Ledger
noun
A notebook that is also a record book is an account book or register, showing the records of all the transactions that have gone through.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
帳簿を燃やしてしまうという考えは思いつきませんでした。
I didn’t think of the idea to burn the account book.