Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Related Party Transactions [Abstract]
Accounts receivable, related parties	$ 83,707	$ 66,191	$ 83,707	$ 66,191	$ 41,816
Due to related parties	44,121	39,640	44,121	39,640	$ 58,512
Sales	7,947	15,811	15,510	15,811
Purchases	$ 56,480	$ 70,028	$ 79,131	$ 88,128