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Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net earnings	$ 30,098	$ 22,430	$ 60,835	$ 62,627
Numerator for basic income per share	30,098	22,430	60,835	62,627
Effect of dilutive securities:
Numerator for diluted income per share	$ 32,618	$ 22,430	$ 60,835	$ 62,627
Denominator:
Denominator for basic income per share - weighted average shares	62,427	62,807	62,491	62,403
Effect of dilutive securities:
Dilutive effect of common stock equivalents	2,624	2,203	2,633	1,930
Dilutive potential common shares	9,955	2,203	2,633	1,930
Denominator for diluted income per share	72,382	65,010	65,124	64,333
Net earnings per share:
Basic earnings per common share	$ 0.48	$ 0.36	$ 0.97	$ 1.00
Diluted earnings per common share	$ 0.45	$ 0.35	$ 0.93	$ 0.97
0.25% Convertible Senior Note Due 2022
Effect of dilutive securities:
Interest expense, net of tax, on 0.25% Convertible Senior Notes due 2022	$ 2,520
Effect of dilutive securities:
0.25% Convertible Senior Notes due 2022	7,331

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