Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Net Income Per Share
Net income	$ 30,464us-gaap_NetIncomeLoss	$ 23,263us-gaap_NetIncomeLoss	$ 59,432us-gaap_NetIncomeLoss	$ 38,262us-gaap_NetIncomeLoss
Weighted average shares outstanding (in shares)	89,942	92,839	90,562	93,124
Dilutive impact from:
Share-based payment awards (in shares)	529	977	634	1,013
Dilutive weighted average shares outstanding (in shares)	90,471	93,816	91,196	94,137
Income per share
Basic (in dollars per share)	$ 0.34us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic
Dilutive (in dollars per share)	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.41us-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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