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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data | Comprehensive Income [Member] | Common Shares [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Jun. 30, 2008 |  | $ 438,471 |  | $ 39,330 | $ 47,541 | $ 110,819 | $ 636,161
Balance (in shares) at Jun. 30, 2008 |  | 51,152,000 |  |  |  |  |
Issuance of Common Shares |  |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 1,539,000 |  |  |  |  |
Under employee stock option plans |  | 18,727 |  |  |  |  | 18,727
Under employee stock purchase plans (in shares) |  | 26,000 |  |  |  |  |
Under employee stock purchase plans |  | 784 |  |  |  |  | 784
Stock compensation |  |  |  | 5,032 |  |  | 5,032
Income tax effect related to stock options exercised |  |  |  | 7,790 |  |  | 7,790
Purchase of treasury stock (in shares) |  |  |  |  |  |  | 0
Comprehensive income: |  |  |  |  |  |  |
Foreign currency translation adjustment | (44,944) |  |  |  |  | (44,944) | (44,944)
Change in actuarial gain (loss) relating to defined benefit pension plan | 813 |  |  |  |  | 813 | 813
Unrealized gain on cash flow hedges | 990 |  |  |  |  | 990 | 990
Unrealized holding gain on available-for-sale securities, net of tax | 4,173 |  |  |  |  | 4,173 | 4,173
Net income for the year | 56,938 |  |  |  | 56,938 |  | 56,938
Total comprehensive income | 17,970 |  |  |  |  |  |
Ending Balance at Jun. 30, 2009 |  | 457,982 |  | 52,152 | 104,479 | 71,851 | 686,464
Ending Balance (in shares) at Jun. 30, 2009 |  | 52,717,000 |  |  |  |  |
Issuance of Common Shares |  |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 474,000 |  |  |  |  | 474,444
Under employee stock option plans |  | 8,941 |  |  |  |  | 8,941
Under employee stock purchase plans (in shares) |  | 27,000 |  |  |  |  |
Under employee stock purchase plans |  | 997 |  |  |  |  | 997
In connection with acquisitions (in shares) |  | 3,608,000 |  |  |  |  |
In connection with acquisitions |  | 134,948 |  |  |  |  | 134,948
Stock compensation |  |  |  | 8,003 |  |  | 8,003
Income tax effect related to stock options exercised |  |  |  | 1,143 |  |  | 1,143
Purchase of treasury stock (in shares) |  |  | (308,000) |  |  |  | 307,579
Purchase of treasury stock |  |  | (14,000) |  |  |  | (14,000)
Comprehensive income: |  |  |  |  |  |  |
Foreign currency translation adjustment | (20,393) |  |  |  |  | (20,393) | (20,393)
Change in actuarial gain (loss) relating to defined benefit pension plan | (2,274) |  |  |  |  | (2,274) | (2,274)
Release of unrealized gain on cash flow hedges | (990) |  |  |  |  | (990) | (990)
Release of unrealized gain on available for sale securities | (4,173) |  |  |  |  | (4,173) | (4,173)
Net income for the year | 89,212 |  |  |  | 89,212 |  | 89,212
Total comprehensive income | 61,382 |  |  |  |  |  |
Ending Balance at Jun. 30, 2010 |  | 602,868 | (14,000) | 61,298 | 193,691 | 44,021 | 887,878
Ending Balance (in shares) at Jun. 30, 2010 |  | 56,826,000 | (308,000) |  |  |  |
Issuance of Common Shares |  |  |  |  |  |  |
Under employee stock option plans (in shares) |  | 439,000 |  |  |  |  | 439,071
Under employee stock option plans |  | 10,090 |  |  |  |  | 10,090
Under employee stock purchase plans (in shares) |  | 31,000 |  |  |  |  |
Under employee stock purchase plans |  | 1,202 |  |  |  |  | 1,202
In connection with acquisitions (in shares) |  | 6,000 |  |  |  |  |
In connection with acquisitions |  | 119 |  | (119) |  |  |
Stock compensation |  |  |  | 11,234 |  |  | 11,234
Income tax effect related to stock options exercised |  |  |  | 1,888 |  |  | 1,888
Purchase of treasury stock (in shares) |  |  | (264,000) |  |  |  | 264,834
Purchase of treasury stock |  |  | (12,499) |  |  |  | (12,499)
Comprehensive income: |  |  |  |  |  |  |
Foreign currency translation adjustment | 15,388 |  |  |  |  | 15,388 | 15,388
Change in actuarial gain (loss) relating to defined benefit pension plan | (214) |  |  |  |  | (214) | (214)
Unrealized gain on cash flow hedges | 1,275 |  |  |  |  | 1,275 | 1,275
Unrealized holding gain on available-for-sale securities, net of tax | 411 |  |  |  |  | 411 | 411
Release of unrealized gain on available for sale securities | (411) |  |  |  |  | (411) | (411)
Net income for the year | 123,203 |  |  |  | 123,203 |  | 123,203
Total comprehensive income | 139,652 |  |  |  |  |  |
Ending Balance at Jun. 30, 2011 |  | $ 614,279 | $ (26,499) | $ 74,301 | $ 316,894 | $ 60,470 | $ 1,039,445
Ending Balance (in shares) at Jun. 30, 2011 |  | 57,302,000 | (572,000) |  |  |  |

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