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Describing the fact that the suggestedmentioned subject is not in the area of your responsibility

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Describing the fact that the suggested subject is not in the area of your field to comment onresponsibility

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Describing the fact that the suggested subject is not your field to comment on

-- What can you tell me about Johnson's progress? Is his professionalism growing?

-- How can I say anything about him? On the very second day of his employment, you moved him to the sales department and I have never seen him since that time. His progress is out of the scope of my reference.

Is "out of the scope of my reference" idiomatic?