Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Numerator
Net earnings (loss)	$ 87,900	$ (98,213)	$ 134,166	$ (124,211)
Series A Mandatory Convertible Preferred Stock Dividends	(6,900)	0	(13,340)	0
Net Earnings (Loss) available to the Common Shareholders	81,000	(98,213)	120,826	(124,211)
Add back interest on Convertible Senior Notes Due 2022	3,066	0	6,132	0
Diluted earnings (loss) available to common shareholders	$ 84,066	$ (98,213)	$ 126,958	$ (124,211)
Denominator
Weighted average shares (in shares)	104,092,000	90,886,000	103,450,000	78,428,000
Effect of dilutive securities:
Common stock equivalents (in shares)	3,630,000	0	3,034,000	0
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
0.25% Convertible Senior Notes due 2022 (in shares)	7,331,000	0	7,331,000	0
Diluted weighted average common shares (in shares)	115,053,000	90,886,000	113,815,000	78,428,000
Basic earnings (loss) per common share (in usd per share)	$ 0.78	$ (1.08)	$ 1.17	$ (1.58)
Diluted earnings (loss) per common share (in usd per share)	$ 0.73	$ (1.08)	$ 1.12	$ (1.58)
0.25% Convertible Senior Notes due 2022
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Debt instrument, interest rate	0.25%	0.25%	0.25%	0.25%