The Idler

There are two plays by this name

The Idler by Charles Haddon Chambers (1891)

A play in four acts by Charles Haddon Chambers (1860-1921)[1].

First performed at St James's Theatre, London, on 26 February, 1891.

Published by Samuel French, 1902.

Facsimlie version of the 1902 edition by Samuel French, The Internet Archive[2]

https://en.wikipedia.org/wiki/Charles_Haddon_Chambers

The Idler by Luigi Pirandello (1916)

This is the title given to an English version of Liolà by Luigi Pirandello (1867–1936)[3]. Described as a Sicilian comedy, this was Pirandello's first play and opened in 1916.

For more on this play, see the ESAT entry on Liolà