What does this phrase mean: "it simply blew my mind"? Is it an idiom?

[sandra]

Test No. incompl/inter-40 "Do you mind?", question 3

I'd honestly never heard such an outstanding performance of that symphony - it simply ......... my mind.

(a) blew
(b) tore
(c) split
(d) broke

Test No. incompl/inter-40 "Do you mind?", answer 3

I'd honestly never heard such an outstanding performance of that symphony - it simply blew my mind.

Correct answer: (a) blew

Your answer was: correct
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Hi, what's the meaning of blow one's mind?Thanks!

[Alan]

This means amazed me more than anything else before in my life.
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English as a Second Language
You can read my ESL story Present Simple