THE PIC OF A B747-100 FREIGHTER FAILS TO MAKE AN ALT XING RESTR 40 DME SE OF IIU; KY.

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INBOUND TO LOUISVILLE INTL ARPT ON AIRWAY; ABOUT 15 NM FROM A TURN ONTO DARBY 2 STAR. ZID LAST ASSIGNED INTERIM DSCNT ALT OF FL240; WHICH WE WERE CLOSELY APCHING. THIS ALT WOULD BE CONSIDERED SOMEWHAT ABOVE PROFILE FOR THE EXPECTED DARBY XING RESTR (11000 FT) ONLY 25-30 NM AHEAD. FURTHER CLRNC TO CROSS 40 DME AT 11000 FT WAS RECEIVED ABOUT THIS TIME; AND DSCNT WAS PROMPTLY STARTED. I THOUGHT THE CLRNC COULD BE COMPLIED WITH; SINCE NO SPD RESTR WAS ISSUED. HOWEVER; THE 11000 FT ALT WAS NOT ACTUALLY MADE UNTIL 4 DME BEYOND THE 40 DME FIX. I DO NOT BELIEVE THERE WAS ANY TFC CONFLICT; NOR WAS THERE ANY COMMENT BY THE CTR CTLR. IN RETROSPECT; I SHOULD HAVE INFORMED THE CTLR EARLY ON ABOUT THE UNCERTAINTY OF MAKING 11000 FT BY 40 DME DUE TO THE FL240 CLRNC RELATIVELY CLOSE IN; IN ORDER TO NEGOTIATE SOME RELIEF. WHAT REALLY CAUSED THE PROB? AS CAPT; I PRIDE MYSELF ON ALWAYS BEING AHEAD OF THE SIT AND PRO-ACTIVE; BUT I HAVE TO THINK THAT ON THIS NIGHT I WAS NOT QUITE GIVING 100% THOUGHT AND EFFORT TO THIS PART OF THE FLT.