Capital Stock (Details) - USD ($)		1 Months Ended		3 Months Ended		12 Months Ended
	Nov. 12, 2013	Nov. 30, 2015	Nov. 30, 2014	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2004
2001 Director Plan
Stock-based compensation disclosure
Stock compensation expense (reduction)				$ (3,000)	$ (30,000)
Stock units issued (in shares)						0
2006 Plan
Stock-based compensation disclosure
Stock compensation expense (reduction)				$ 4,400,000	5,700,000
Stock options granted to directors (in shares)				1,676,599
2006 Plan | Stock options
Stock-based compensation disclosure
Stock options granted to directors (in shares)				3,341,000
Compensation Policy for Non-Employee Directors | Stock options
Stock-based compensation disclosure
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 disclosure
Stock compensation expense (reduction)				$ 108,000	$ 82,000
Vesting period	1 year