Earnings per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net earnings	$ 25,256us-gaap_NetIncomeLoss	$ 18,486us-gaap_NetIncomeLoss	$ 94,212us-gaap_NetIncomeLoss	$ 73,096us-gaap_NetIncomeLoss
Basic average shares outstanding (in shares)	44,549,000	44,649,000	44,497,000	44,665,000
Dilutive effect of stock options and equivalents (in shares)	838,000	727,000	792,000	797,000
Diluted average shares outstanding (in shares)	45,387,000	45,376,000	45,289,000	45,462,000
Earnings per share
Basic earnings per share (in usd per share)	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 2.12us-gaap_EarningsPerShareBasic	$ 1.64us-gaap_EarningsPerShareBasic
Diluted earnings per share (in usd per share)	$ 0.56us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 2.08us-gaap_EarningsPerShareDiluted	$ 1.61us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options exercised to purchase common shares			900,000	1,200,000
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive options excluded from calculation of earnings per share, number of options	600,000	2,000,000	1,000,000	1,700,000
Antidilutive options excluded from calculation of earnings per share, weighted average exercise price	$ 50.98	$ 50.02	$ 50.49	$ 50.62

Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Exercise Price

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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Number of share options (or share units) exercised during the current period.

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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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