Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Net Income Per Share
Net income	$ 28,170us-gaap_NetIncomeLoss	$ 20,843us-gaap_NetIncomeLoss	$ 87,601us-gaap_NetIncomeLoss	$ 59,105us-gaap_NetIncomeLoss
Weighted average shares outstanding (in shares)	87,355	92,414	89,509	92,891
Dilutive impact from:
Share-based payment awards (in shares)	498	951	612	1,060
Dilutive weighted average shares outstanding (in shares)	87,853	93,365	90,121	93,951
Income per share
Basic (in dollars per share)	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 0.98us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic
Dilutive (in dollars per share)	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.97us-gaap_EarningsPerShareDiluted	$ 0.63us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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