SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Schedule of Weighted-Average Fair Value Of Options And Weighted-Average Assumptions Used (Details) - $ / shares	3 Months Ended	9 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (in dollars per share)	$ 8.86	$ 7.28	$ 8.41	$ 6.95
Weighted-average assumptions used:
Expected volatility	26.59%	21.80%	26.20%	21.92%
Risk–free interest rate	0.32%	1.38%	0.21%	1.49%
Expected dividend yield	1.54%	1.55%	1.54%	1.60%
Expected life (in years)	4 years 1 month 20 days	4 years 1 month 20 days	4 years 7 months 17 days	4 years 1 month 17 days
Forfeiture rate (based on historical rates)	7.00%	7.00%	7.00%	7.00%
Average exercised share price (in dollars per share)	$ 48.74	$ 44.99	$ 45.57	$ 42.57
Performance Share Units (issued under LTIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (in dollars per share)			$ 10.18
Derived service period (in years)	0 years	0 years	1 year 9 months 18 days	0 years
Weighted-average assumptions used:
Expected volatility			28.00%
Risk–free interest rate			0.42%
Expected dividend yield			1.70%
Average exercised share price (in dollars per share)			$ 45.81

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Derived Service Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate

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Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Average Exercise Price

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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