Net Income Per Common Share (EPS) - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Income (Numerator): Net income	$ 10,768	$ 1,269	$ 21,914	$ 6,501
Income (Numerator): Basic earnings per share, income available to common stockholders	10,768	1,269	21,914	6,501
Income (Numerator): Diluted earnings per share	$ 10,768	$ 1,269	$ 21,914	$ 6,501
Shares (Denominator): Basic earnings per share, income available to common stockholders	92,434	77,174	93,780	78,411
Shares (Denominator): Stock options	46	65	51	63
Shares (Denominator): Diluted earnings per share	92,480	77,239	93,831	78,474
Per Share Amount: Basic earnings per share, income available to common stockholders	$ 0.12	$ 0.02	$ 0.23	$ 0.08
Per Share Amount: Diluted earnings per share	$ 0.12	$ 0.02	$ 0.23	$ 0.08