DERIVATIVE FINANCIAL INSTRUMENTS: (Details) (Cash Flow Hedges, Forward foreign currency contracts, USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2012
Cash Flow Hedges | Forward foreign currency contracts
Derivative financial instruments
Amount of hedged item (in Canadian dollars)		$ 0.6
Gain (Loss) Recognized in Other Comprehensive (Loss) Income	$ 0.4