Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $)	12 Months Ended									3 Months Ended	0 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended				12 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2012 Stock Options [Member]	Jun. 30, 2011 Stock Options [Member]	Jun. 30, 2010 Stock Options [Member]	Jun. 30, 2012 Deferred Stock Units [Member]	Jun. 30, 2011 Deferred Stock Units [Member]	Jun. 30, 2010 Deferred Stock Units [Member]	Mar. 31, 2012 Restricted Stock Units (RSU) [Member]	Jul. 21, 2009 Restricted Stock Awards [Member]	Jun. 30, 2012 Employee Share Purchase Plan [Member]	Jun. 30, 2011 Employee Share Purchase Plan [Member]	Jun. 30, 2010 Employee Share Purchase Plan [Member]	Sep. 30, 2007 LTIP [Member]	Jun. 30, 2012 LTIP [Member]	Jun. 30, 2011 LTIP [Member]	Jun. 30, 2010 LTIP [Member]	Sep. 30, 2010 Fiscal 2008 LTIP [Member]	Jun. 30, 2009 Fiscal 2009 LTIP [Member]	Sep. 30, 2011 Fiscal 2009 LTIP [Member]	Jun. 30, 2012 Fiscal 2010, 2011 and 2012 LTIP [Member]	Jun. 30, 2011 Fiscal 2010, 2011 and 2012 LTIP [Member]	Jun. 30, 2010 Fiscal 2010 LTIP [Member]	Jun. 30, 2011 Fiscal 2011 LTIP [Member]	Jun. 30, 2012 Fiscal 2012 LTIP [Member]	Jun. 30, 2010 Maximum [Member] Fiscal 2010 LTIP [Member]	Jun. 30, 2011 Maximum [Member] Fiscal 2011 LTIP [Member]	Jun. 30, 2012 Maximum [Member] Fiscal 2012 LTIP [Member]	Jun. 30, 2010 Minimum [Member] Fiscal 2010 LTIP [Member]	Jun. 30, 2011 Minimum [Member] Fiscal 2011 LTIP [Member]	Jun. 30, 2012 Minimum [Member] Fiscal 2012 LTIP [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]
Purchase of treasury stock (in shares)	221,081	264,834	307,579
Purchase of treasury stock	$ 10,888,000	$ 12,499,000	$ 14,000,000
Common shares reissued (in shares)	0	0
Number of options outstanding (in shares)	2,147,151	2,277,733	2,669,142
Common shares available for issuance (in shares)	437,795
Vesting period				4 years	4 years	4 years				3 years
Expire period of options, minimum term				7 years	7 years	7 years
Expire period of options, maximum term				10 years	10 years	10 years
Unrecognized compensation cost relating to unvested stock awards	16,800,000
Unvested stock awards compensation cost, weighted average recognition period (in years)	3 years
Cash proceeds from exercise of options granted	19,200,000	10,100,000	8,900,000
Tax benefit realized from exercise of options	3,700,000	2,800,000	1,900,000
Amount granted (in shares)							9,299	6,606	4,299	33,333	574,767													307,579	264,834	234,146
Restricted stock units, vest rate (in shares)										11,111
Restricted stock awards granted, value (in dollars per share)											$ 13.33
Plan term (in years)															3 years
Average stock price of common stock, average period															30 days
Additional allocated share-based compensation expense																1,000,000	53,000	197,000
Awards settled in cash in the aggregate amount																			14,400,000		10,700,000
LTIP equity plans, estimated award grant percentage against target																				100.00%				100.00%	100.00%		150.00%	150.00%	150.00%	50.00%	50.00%	0.00%
Compensation cost expensed during the period-LTIP equity plans																						12,800,000	7,300,000	1,500,000
Cash received from employee stock purchase plan												$ 2,100,000	$ 1,400,000	$ 1,100,000