Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) (Accounts Receivable - Allowances for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Accounts Receivable - Allowances for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 28,650		$ 31,845		$ 23,655
Additions Charged to Costs and Expenses	20,310		23,427		18,829
Additions Charged to Other Accounts	7,163	[1]	4,034	[1]	2,967	[1]
Deductions	(24,366)	[2]	(30,656)	[2]	(13,606)	[2]
Balance at End of Period	$ 31,757		$ 28,650		$ 31,845

[1] Principally reflects subsequent collections of accounts previously written-off.

[2] Write-off of uncollectible accounts.