Yeah I was wondering the same thing why it dropped 10% in a day. Doesn't seem to be any single event that caused the price to suddenly drop, however agree with benjitara that the price ran ahead of its long term valuation.
In saying that, I do like its medium to long term growth prospects. Seems to be reaching saturation/maturity in Aus and NZ but from the looks of things they've cracked the formula in Canada and should be able to roll new stores out full steam, and beginning to turn things around in the US