Capital Stock (Details) - USD ($)				1 Months Ended		12 Months Ended
	Nov. 11, 2014	Sep. 22, 2010	Nov. 11, 2009	Sep. 30, 2006	Jun. 30, 2004	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Nov. 30, 2013	Nov. 30, 2001
Stock-Based Compensation
Proceeds from stock options exercised						$ 4,429,000	$ 9,136,000	$ 4,026,000
Compensation expense (expense reduction)						$ 15,715,000	16,080,000	12,751,000
Stock options granted to directors (in shares)	1,676,599
2006 Plan and 2004 Director Plan
Stock-Based Compensation
Aggregate number of common shares reserved for future issuance						16,200,000
2006 Plan
Stock-Based Compensation
Common stock reserved for grant (in shares)	17,500,000
Compensation expense						$ 15,300,000	15,600,000	12,400,000
2006 Plan | Stock options
Stock-Based Compensation
Options exercised (in shares)						651,000
Exercise price (in dollars per share)						$ 3.19
Exercise price (in dollars per share)						$ 10.89
Proceeds from stock options exercised						$ 4,429,000	$ 9,136,000	$ 4,026,000
Exercisable at the end of the period (in shares)						5,380,000	4,637,000	4,202,000
Weighted-Average Exercise Price (in dollars per share)						$ 11.89	$ 9.79	$ 7.97
Stock options granted to directors (in shares)						2,743,000
2001 Director Plan
Stock-Based Compensation
Common stock reserved for grant (in shares)										50,000
2001 Director Plan | Deferred share units
Stock-Based Compensation
Stock units outstanding (in shares)						6,000	6,000	6,000
Compensation expense (expense reduction)						$ 16,000	$ (30,000)	$ (1,000)
Stock units issued (in shares)						0
2004 Director Plan | Deferred share units
Stock-Based Compensation
Monthly vesting rights (as a percent)					8.30%
Maximum vesting period from the date units were credited to the non-employee director for the award to be vested on September 16, 2009					1 year
2004 Amended Director Plan | Deferred share units
Stock-Based Compensation
Vesting period				3 years
Compensation Policy for Non-Employee Directors | Initial equity grant upon election to the Board
Stock-Based Compensation
Vesting period			3 years
Aggregate market value of award			$ 65,000
Compensation Policy for Non-Employee Directors | Equity grant on first anniversary of initial election to the board
Stock-Based Compensation
Aggregate market value of award			$ 30,000
Compensation Policy for Non-Employee Directors | Annual equity grant
Stock-Based Compensation
Vesting period			1 year
Aggregate market value of award			$ 30,000
Compensation Policy for Non-Employee Directors | Stock options
Stock-Based Compensation
Vesting period		1 year
Grant date fair value		$ 30,000
Stock options granted to directors (in shares)						80,000	80,000	41,805
Compensation Policy for Non-Employee Directors | Deferred share units
Stock-Based Compensation
Compensation expense						$ 389,000	$ 433,000	$ 351,000
Number of shares of common stock issued under 2009 Compensation Policy for each vested deferred stock unit held on the date a director ceases to be a member			1
Stock units issued (in shares)						31,000	28,000	26,000
Stock units previously granted (in shares)						15,000	19,000	21,000
Common stock issued to settle retiring director's share units (in shares)									43,615