ALLEN PARK, Mich. (AP) - Detroit Lions coach Jim Schwartz admitted Monday that his team's season has ``gone off the rails'' and the progress made during last year's run to the playoffs has become a distant memory.

Schwartz, who has lost at least 10 games in three of his four seasons as Lions' coach, said the blame for the team's unfulfilled 2012 expectations rests entirely with him.

Schwartz said, ``I need to do a better job. 4-10 isn't good enough.''

Detroit's 38-10 loss at Arizona on Sunday was its sixth straight and the team's most lopsided defeat since a 48-3 loss at Baltimore in 2009. It also bucked the trend: After defeating Jacksonville on Nov. 4, Detroit lost its next five games by an average of 5.2 points, only to get hammered by the Cardinals.