What is president roosevelt referring to with the phrase "idled through no fault of your own? "

Not due to misconduct

Explanation:

Means Not due to misconduct, but it's helpful to look at the question in terms of, "could the employee have prevented the problem?" Certainly, drinking on the job and the other examples you cite will be misconduct, and the discharged employee had better not count on unemployment compensation. But other types of less serious conduct will also me misconduct, such as insubordination to the worker's supervisor, arriving late to work, or chatting with coworkers while ignoring waiting customers.