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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Additional Information (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2024 | Apr. 30, 2024 | Nov. 04, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Cash Dividends |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  | $ 1.00 | $ 0.9720 | $ 0.8836
Payments of dividends |  |  |  | $ 267,362,000 | $ 259,549,000 | $ 237,655,000
Share Capital |  |  |  |  |  |
Preference shares issued (in shares) |  |  |  | 0 |  |
Treasury Stock |  |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  | 1,400,000 | 521,136 | 2,630,000
Purchase of treasury stock |  |  |  | $ 53,085,000 | $ 21,919,000 | $ 111,593,000
Issuance of treasury stock (in shares) |  |  |  | 1,800,395 | 691,181 | 491,244
Issuance of treasury stock |  |  |  | $ 0 | $ (1,067,000) | $ 0
Stock Repurchase Plan |  |  |  |  |  |
Stock repurchased and retired (in shares) |  |  |  |  | 0 | 3,809,559
Stock repurchased and retired |  |  |  |  | $ 0 | $ 177,000,000.0
Performance options granted (in shares) |  |  |  | 2,148,780 |  |
Aggregate intrinsic value of options exercised |  |  |  | $ 7,000,000.0 | 1,800,000 | 17,000,000.0
Cash proceeds from exercise of options granted |  |  |  | 31,400,000 | 7,800,000 | 32,700,000
Tax benefit realized from exercise of options |  |  |  | $ 1,500,000 | $ 300,000 | $ 2,800,000
Subsequent event |  |  |  |  |  |
Cash Dividends |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.2625 |  |  |  |  |
Twenty Twenty Two Share Repurchase Plan |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Stock repurchase plan, period in force (in months) |  |  | 12 months |  |  |
Stock repurchase plan, authorized amount |  |  | $ 350,000,000 |  |  |
Twenty Twenty Four Share Repurchase Plan |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Stock repurchase plan, period in force (in months) |  | 12 months |  |  |  |
Stock repurchase plan, authorized amount |  | $ 250,000,000 |  |  |  |
Stock repurchased and retired (in shares) |  |  |  | 5,073,913 |  |
Stock repurchased and retired |  |  |  | $ 152,300,000 |  |
Employee stock option |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Expiration period of options, minimum term (in years) |  |  |  | 7 years |  |
Expiration period of options, maximum term (in years) |  |  |  | 10 years |  |
Performance stock options |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Performance options granted (in shares) |  |  |  | 0 | 1,000,000 | 0
Deferred Share Units (DSUs) |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 0 | 30,273 | 0
Value of shares issued |  |  |  | $ 0 | $ 1,100,000 | $ 0
Minimum | Employee stock option |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 4 years |  |
Maximum | Employee stock option |  |  |  |  |  |
Stock Repurchase Plan |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 5 years |  |
Long Term Incentive Plan |  |  |  |  |  |
Treasury Stock |  |  |  |  |  |
Issuance of treasury stock (in shares) |  |  |  | 223,577 |  |
Issuance of treasury stock |  |  |  | $ 10,700,000 |  |
Stock Repurchase Plan |  |  |  |  |  |
Award vesting period (in years) |  |  |  | 3 years |  |

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