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Derivative Instruments And Hedging Activities (Fair Value Of Derivative Instruments In The Condensed Consolidated Balance Sheets) (Details) (USD $)
Mar. 31, 2012
Jun. 30, 2011
Derivatives, Fair Value [Line Items]    
Notional amount forward contracts held to sell U.S. dollars in exchange for Canadian dollars $ 99,600,000 $ 16,800,000
Accounts Payable And Accrued Liabilities [Member] | Cash Flow Hedging [Member] | Designated As Hedging Instrument [Member] | Foreign Exchange Forward [Member]
   
Derivatives, Fair Value [Line Items]    
Fair Value Asset $ 1,296,000