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Share Capital, Option Plans And Share-Based Payments (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 2 Months Ended | 12 Months Ended | 2 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Y | Mar. 31, 2011 | Jun. 30, 2009 | Jun. 30, 2011 | Mar. 31, 2012 Stock Option [Member] | Mar. 31, 2012 Deferred Stock Units [Member] | Mar. 31, 2011 Deferred Stock Units [Member] | Mar. 31, 2012 Deferred Stock Units [Member] | Mar. 31, 2011 Deferred Stock Units [Member] | Mar. 31, 2012 Restricted Stock Units (RSU) [Member] | Sep. 30, 2007 Restricted Stock Units (RSU) [Member] | Jul. 21, 2009 Restricted Stock Awards [Member] | Mar. 31, 2012 Employee Share Purchase Plan [Member] | Mar. 31, 2011 Employee Share Purchase Plan [Member] | Mar. 31, 2012 Employee Share Purchase Plan [Member] | Mar. 31, 2011 Employee Share Purchase Plan [Member] | Mar. 31, 2012 Performance Stock Units [Member] | Sep. 30, 2010 LTIP 1 [Member] | Sep. 30, 2011 LTIP 2 [Member] | Jun. 30, 2010 LTIP 3 [Member] | Jun. 30, 2011 LTIP 4 [Member] | Mar. 31, 2012 LTIP 3 And LTIP 4 [Member] | Mar. 31, 2011 LTIP 3 And LTIP 4 [Member] | Mar. 31, 2012 LTIP 3 And LTIP 4 [Member] | Mar. 31, 2011 LTIP 3 And LTIP 4 [Member] | Jun. 30, 2010 Maximum [Member] LTIP 3 [Member] | Jun. 30, 2011 Maximum [Member] LTIP 4 [Member] | Mar. 31, 2012 Maximum [Member] LTIP 5 [Member] | Jun. 30, 2010 Minimum [Member] LTIP 3 [Member] | Jun. 30, 2011 Minimum [Member] LTIP 4 [Member] | Mar. 31, 2012 Minimum [Member] LTIP 5 [Member]
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  | 0 |  | 264,834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  | $ (12,499,000) | $ 0 | $ (12,499,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares reissued (in shares) | 0 |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding (in shares) | 2,002,776 |  | 2,002,776 |  |  | 2,277,733 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares available for issuance (in shares) | 792,795 |  | 792,795 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  | 4 years |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expire period of options, minimum (in years) |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expire period of options, maximum (in years) |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost relating to unvested stock awards | 12,600,000 |  | 12,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested stock awards compensation cost, weighted average recognition period (in years) |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from exercise of options granted | 6,500,000 | 4,400,000 | 16,700,000 | 8,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefit realized from exercise of options | 2,900,000 | 1,300,000 | 3,700,000 | 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount granted (in shares) |  |  |  |  |  |  |  | 2,066 | 1,548 | 9,089 | 6,426 | 33,333 |  | 574,767 |  |  |  |  | 219,721 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 | 2,000,000 | 9,800,000 | 5,400,000 |  |  |  |  |  |
Cash received from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 | $ 500,000 | $ 1,600,000 | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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