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 $)	Mar. 31, 2013	Mar. 31, 2012
Estimate of Fair Value, Fair Value Disclosure [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	$ 13,631,000	$ 11,126,000
Derivative assets - variable interest rate swap agreements	2,490,000	6,734,000
Assets, Fair Value Disclosure	16,121,000	17,860,000
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	13,631,000	11,126,000
Contingent consideration liability	3,632,000	2,512,000
Total liabilities measured at fair value on a recurring basis	17,263,000	13,638,000
Quoted Prices In Active Markets Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	13,631,000	11,126,000
Derivative assets - variable interest rate swap agreements	0	0
Assets, Fair Value Disclosure	13,631,000	11,126,000
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	13,631,000	11,126,000
Contingent consideration liability	0	0
Total liabilities measured at fair value on a recurring basis	13,631,000	11,126,000
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	2,490,000	6,734,000
Assets, Fair Value Disclosure	2,490,000	6,734,000
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
Assets, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	0	0
Contingent consideration liability	3,632,000	2,512,000
Total liabilities measured at fair value on a recurring basis	$ 3,632,000	$ 2,512,000