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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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