Supplemental Financial Information (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Supplemental Cash Flow Information [Abstract]
Cash paid for income taxes	$ 25,500,000	$ 25,700,000	$ 21,400,000
Cash paid for interest on borrowings	40,200,000	34,600,000	28,800,000
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balances at Beginning of Year	2,918,000	2,764,000	2,602,000
Charged to Cost and Expense	104,000	245,000	516,000
Deductions	(401,000)	(91,000)	(354,000)
Balance at End of Year	$ 2,621,000	$ 2,918,000	$ 2,764,000