Select the most appropriate idiom that can substitute the underlined segment in the given sentence.
The players like the coach because he is honest, realistic and practical in dealing with them.

The correct answer is down to earth.

Let us analyze the meaning of the underlined segment "honest, realistic and practical" and compare it with the given options:
1. Down to earth: This idiom means being practical, realistic, honest, and straightforward. It directly substitutes the underlined segment.
2. By and large: This idiom means on the whole or speaking generally.
3. Far and wide: This idiom means over a large area or distance.
4. Sick and tired: This idiom means thoroughly weary, annoyed, or bored with something.

Therefore, "down to earth" is the most appropriate idiom to substitute the underlined phrase.