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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 2.0	$ 1.8
Property and equipment, accumulated depreciation	$ 129.5	$ 127.4
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	63,030,058	62,889,679
Common stock, shares outstanding	34,527,728	35,249,803
Common treasury shares	28,502,330	27,639,876

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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