Lyon described the 16-point win at the MCG on Saturday as 'fantastic' but insisted he did not see it as a significant turning point for the club, who are playing finals for just the fourth time in their history.
"We've finished seventh, we've come and won one a final. There's no coming of age,'' Lyon said at his post-match press conference.
"This is about one week, one final, that's all it means. We get to go to the next grid and have a go.
"We're a serious football club, we're about improvement. One win doesn't make or break football clubs. We haven't achieved anything yet."
The well-drilled Dockers jumped the stunned Cats from the opening bounce to open up a 36-point quarter-time advantage, before withstanding a brave fightback from the reigning premiers who reduced the lead to within three goals during the final term.
"I thought they had a more dominant second half than us, and we had a dominant first half. They never gave up and they made us fight it out," Lyon said.
"A lesser team probably would have put the cue in the rack, to be honest. But they kept coming at us, which is good for our group to understand that's what makes them great and that's what we want to head to.
"It was really good. Just that we won the ball, made some really good decisions with the ball, lowered our eyes really well and hit the scoreboard a lot.
"I'm rapt for the players who have been preparing extraordinarily well, really since I walked through the door.''
The Dockers couldn't have won without their captain Matthew Pavlich, who led the MCG assault with three first-term goals, and ended with nine marks and six majors.
"Instinctively, it probably is up there with the first final win that we had a number of years ago now," Pavlich said after the match.
"Particularly against a side that we respect so highly. They've been there and done it many times before, reigning premiers and some champion players.
"We really respect their team and their club and to come out and really perform on the big stage that is the MCG on Saturday night is pleasing."
The Dockers are now preparing for Friday night's semi-final against the Crows in Adelaide.