Net Income Per Share and Stockholders' Equity - Summary of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
NET INCOME (LOSS) PER SHARE — BASIC:
Net income (loss) attributable to ADS	$ 224,230	$ (193,174)	$ 77,772
Dividends paid to participating securities	(5,591)	(11,544)	(2,116)
Net income available to common stockholders and participating securities	218,639	(204,718)	75,656
Undistributed income allocated to participating securities	(33,251)		(5,474)
Net income available to common stockholders — Basic	$ 185,388	$ (204,718)	$ 70,182
Weighted average number of common shares outstanding — Basic	70,155	63,820	57,025
Net income (loss) per common share — Basic	$ 2.64	$ (3.21)	$ 1.23
NET INCOME (LOSS) PER SHARE — DILUTED:
Net income (loss) available to common stockholders — Diluted	$ 185,388	$ (204,718)	$ 70,182
Weighted average number of common shares outstanding — Basic	70,155	63,820	57,025
Weighted average number of common shares outstanding — Diluted	71,566	63,820	57,611
Net income (loss) per common share —Diluted	$ 2.59	$ (3.21)	$ 1.22
Potentially dilutive securities excluded as anti-dilutive	14,594	14,449	5,966
Restricted Stock - Nonparticipating [Member]
NET INCOME (LOSS) PER SHARE — DILUTED:
Dilutive securities	247		39
Performance Shares [Member]
NET INCOME (LOSS) PER SHARE — DILUTED:
Dilutive securities	320
Exercise of Stock Options [Member]
NET INCOME (LOSS) PER SHARE — DILUTED:
Dilutive securities	844		547