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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Nov. 03, 2021	Sep. 30, 2021	Sep. 30, 2020	Nov. 11, 2022	Nov. 11, 2021	Nov. 12, 2021	Nov. 12, 2020
Cash Dividends
Dividends declared per common share (in dollars per share)		$ 0.2209	$ 0.1746
Payments of dividends		$ 59,878,000	$ 47,269,000
Share Capital
Preference shares issued (in shares)		0
Treasury Stock
Purchase of treasury stock (in shares)		0	965,154
Payments for repurchase of common stock			$ 41,900,000
Issuance of treasury stock (in shares)		141,452	193,680
Stock Repurchase Plan
Stock repurchase plan, shares acquired (in shares)		0	965,154
Subsequent Event
Cash Dividends
Dividends declared per common share (in dollars per share)	$ 0.2209
Share Repurchase Plan
Treasury Stock
Purchase of treasury stock (in shares)		0
Stock Repurchase Plan
Stock repurchase plan, authorized amount							$ 350,000,000
Stock repurchase plan, shares acquired (in shares)		0
Share Repurchase Plan | Subsequent Event
Stock Repurchase Plan
Stock repurchase plan, authorized amount						$ 350,000,000
Share Repurchase Plan | Forecast
Stock Repurchase Plan
Stock repurchase plan, period in force					12 months
Share Repurchase Plan | Forecast | Subsequent Event
Stock Repurchase Plan
Stock repurchase plan, period in force				12 months

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