Fair Value Of Financial Assets And Liabilities (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	$ 12,730	$ 11,126
Derivative assets - variable interest rate swap agreements	3,725	6,734
Total assets measured at fair value on a recurring basis	16,455	17,860
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	12,730	11,126
Contingent consideration liability	4,104	2,512
Total liabilities measured at fair value on a recurring basis	16,834	13,638
Quoted Prices In Active Markets Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	12,730	11,126
Derivative assets - variable interest rate swap agreements	0	0
Total assets measured at fair value on a recurring basis	12,730	11,126
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	12,730	11,126
Contingent consideration liability	0	0
Total liabilities measured at fair value on a recurring basis	12,730	11,126
Significant Other Observable Inputs Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	0	0
Derivative assets - variable interest rate swap agreements	3,725	6,734
Total assets measured at fair value on a recurring basis	3,725	6,734
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	0	0
Contingent consideration liability	0	0
Total liabilities measured at fair value on a recurring basis	0	0
Significant Unobservable Inputs Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	0	0
Derivative assets - variable interest rate swap agreements	0	0
Total assets measured at fair value on a recurring basis	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	0	0
Contingent consideration liability	4,104	2,512
Total liabilities measured at fair value on a recurring basis	$ 4,104	$ 2,512