Path: utzoo!attcan!uunet!husc6!ogccse!blake!uw-beaver!cornell!mailrus!tut.cis.ohio-state.edu!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: Detecting idle X server
Message-ID: <8904272347.AA01792@expire.lcs.mit.edu>
Date: 27 Apr 89 23:47:49 GMT
References: <7456@spool.cs.wisc.edu>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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    Is there a way get this value by querying the X server?

No.  It would require a protocol extension.