Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015		Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets fair value	$ 20,547		$ 756
Derivative financial instrument asset (liability) (note 16)	273		756
Significant other observable inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets fair value	20,547		756
Derivative financial instrument asset (liability) (note 16)	273		756
Corporate Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets fair value	20,274	[1]	0
Corporate Bond Securities [Member] | Significant other observable inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring assets fair value	$ 20,274		$ 0

[1] These assets in the table above are classified as Level 2 as certain specific assets included within may not have quoted prices that are readily accessible in an active market or we may have relied on alternative pricing methods that do not rely exclusively on quoted prices to determine the fair value of the investments.