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Earnings Per Share - Calculation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 42,046	$ 36,663
Weighted-average number of basic shares outstanding during the period	24,487	24,340
Dilutive effect of RSUs after application of treasury stock method	756	588
Weighted-average number of diluted shares outstanding during the period	25,243	24,928
Basic earnings per share	$ 1.72	$ 1.51
Diluted earnings per share	$ 1.67	$ 1.47

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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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