SHAREHOLDERS' EQUITY: (Details) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($) shares
Stockholders' Equity [Line Items]
Stock repurchased during period (in shares) \| shares	585,967	585,967
Remaining authorized repurchase amount	$ 50.4	$ 50.4
Additional Paid-in Capital
Stockholders' Equity [Line Items]
Increase (decrease) in additional paid-in capital		(6.0)
Stock repurchased during period, value	$ 9.6	9.6
Adjustments to APIC offset by other stock-based compensation activity		2.9
Stock-based compensation		$ 6.5

[Line Items] for Stockholders' Equity [Table]

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Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP).

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Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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The increase (decrease) in stockholders' equity during the period.

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