Special Charges and Other, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Nonrecurring (Income) Expense [Abstract]
Employee separation costs	$ 301	$ 9,205	$ 1,387	$ 28,821
Gain on sale of assets	0	0	(4,447)	0
Impairment charges	0	0	100	1,961
Contract exit costs	19,568	302	20,154	340
Other	3	36	(78)	456
Special charges and other, net	$ 19,872	$ 9,543	$ 17,116	$ 31,578