Supplemental Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]
Cash paid for income taxes	$ 25,400	$ 25,500	$ 25,700
Cash paid for interest on borrowings	52,900	40,200	34,600
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balances at Beginning of Year	2,621	2,918	2,764
Charged to Cost and Expense	59	104	245
Deductions	(140)	(401)	(91)
Balance at End of Year	2,540	2,621	2,918
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balances at Beginning of Year	116,482	93,811	88,637
Charged to Cost and Expense	5,535	0	0
Charged to Other Accounts	47,834	36,957	5,174
Deductions	(8,017)	(14,286)	0
Balance at End of Year	$ 161,834	$ 116,482	$ 93,811