Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 29,372	$ 17,959	$ 63,023	$ 36,433
Currency translation gain (loss)	2,837	2,558	(1,975)	5,985
Comprehensive income	32,209	20,517	61,048	42,418
Less: other comprehensive gain (loss) attributable to noncontrolling interest	996	(239)	(379)	612
Less: net income attributable to noncontrolling interest	702	96	2,073	828
Total comprehensive income attributable to ADS	$ 30,511	$ 20,660	$ 59,354	$ 40,978