After hitting a one-week high against the yen on Wednesday, which saw the dollar touch 134.40, the greenback hit a session low against the yen on Thursday.
The dollar last fell 1.050% versus the yen to 133.065.
The dollar also fell against the Swiss franc to as low as 0.9208, the lowest level since March 31.
Against a basket of currencies, the U.S. dollar index fell 0.23% to 104.100, having climbed 0.18% in the previous session.
The aussie was last 0.28% versus the greenback at $0.676., while the kiwi last rose 0.55% versus the greenback at $0.634.