The greenback hit 94.08 yen, its highest since Feb. 25, with traders taking out minor stops above 94 yen. There are bigger stops in the 94.50 area, they said, which when triggered could further extend the dollar's gains.

The dollar was last at 94.05, up 0.8 percent on the day.

Broad market optimism about the US economy following an upbeat US private sector jobs report also boosted the dollar.