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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset (note 15) $ 2,925 $ 283
Total recurring assets fair value 2,925 283
Quoted prices in active markets for identical assets/(liabilities) (Level 1) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset (note 15)      
Total recurring assets fair value      
Significant other observable inputs (Level 2) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset (note 15) 2,925 283
Total recurring assets fair value 2,925 283
Significant unobservable inputs (Level 3) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset (note 15)      
Total recurring assets fair value