Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net earnings (loss)									$ (67,029)	$ 107,517	$ 88,002
Divided by:
Weighted average shares (in shares)									84,828	63,584	62,499
Dilutive effect of common stock equivalents (in shares)									0	2,220	2,634
Diluted weighted average common shares (in shares)									84,828	65,804	65,133
Basic earnings (loss) per common share (in usd per share)	$ 0.56	$ 0.07	$ (1.08)	$ (0.39)	$ 0.44	$ 0.39	$ 0.45	$ 0.41	$ (0.79)	$ 1.69	$ 1.41
Diluted earnings per common share (in usd per share)	$ 0.53	$ 0.06	$ (1.08)	$ (0.39)	$ 0.43	$ 0.38	$ 0.44	$ 0.40	$ (0.79)	$ 1.63	$ 1.35