Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Basic Earnings per Share
Net earnings (loss)	$ (98,213)	$ 28,702	$ (124,211)	$ 54,851
Weighted average shares	90,886	63,588	78,428	63,504
Basic earnings (loss) per common share	$ (1.08)	$ 0.45	$ (1.58)	$ 0.86
Diluted Earnings per Share
Net earnings (loss)	$ (98,213)	$ 28,702	$ (124,211)	$ 54,851
Weighted average shares	90,886	63,588	78,428	63,504
Dilutive effect of common stock equivalents		2,085		2,412
Diluted weighted average common shares	90,886	65,673	78,428	65,916
Diluted earnings (loss) per common share	$ (1.08)	$ 0.44	$ (1.58)	$ 0.83