”From A to Z” 是什麼意思呢?

"I was responsible for the 9/11 operation, from A to Z," said Khalid Sheikh Mohammed in a transcript of a US hearing at Guantanamo Bay prison camp.

請問上面這段這個人提到的 from A to Z 是代表什麼意思?這種用法常見嗎?請英文高手解答,謝謝!!
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