Capital Stock (Details) - USD ($)	3 Months Ended		12 Months Ended		135 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2015
Stock-Based Compensation
Compensation expense (expense reduction)	$ 5,783,000	$ 5,410,000
Stock options granted to directors (in shares)	1,676,599
2001 Director Plan | Stock options
Stock-Based Compensation
Compensation expense (expense reduction)	$ (30,000)	(8,000)
Stock units issued (in shares)					0
Compensation Policy for Non-Employee Directors | Stock options
Stock-Based Compensation
Vesting period	1 year
Stock options granted to directors (in shares)			80,000	80,000
Compensation Policy for Non-Employee Directors | Deferred share units
Stock-Based Compensation
Stock compensation expense	$ 82,000	$ 118,000
Vesting period	1 year