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, 2011	Mar. 31, 2011
Quoted Prices In Active Markets Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	$ 10,537	$ 9,160
Total assets measured at fair value on a recurring basis	10,537	9,160
Deferred compensation plan liabilities	10,537	9,160
Business Acquisition, Contingent Consideration, at Fair Value	0
Total liabilities measured at fair value on a recurring basis	10,537	9,160
Quoted Prices In Active Markets Level 1 [Member] | Variable Interest Rate Swap Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Significant Other Observable Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	0	0
Total assets measured at fair value on a recurring basis	7,037	5,086
Deferred compensation plan liabilities	0	0
Business Acquisition, Contingent Consideration, at Fair Value	0
Total liabilities measured at fair value on a recurring basis	0	0
Significant Other Observable Inputs Level 2 [Member] | Variable Interest Rate Swap Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	7,037	5,086
Significant Unobservable Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	0	0
Total assets measured at fair value on a recurring basis	0	0
Deferred compensation plan liabilities	0	0
Business Acquisition, Contingent Consideration, at Fair Value	2,450
Total liabilities measured at fair value on a recurring basis	2,450	0
Significant Unobservable Inputs Level 3 [Member] | Variable Interest Rate Swap Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	10,537	9,160
Total assets measured at fair value on a recurring basis	17,574	14,246
Deferred compensation plan liabilities	10,537	9,160
Business Acquisition, Contingent Consideration, at Fair Value	2,450
Total liabilities measured at fair value on a recurring basis	12,987	9,160
Estimate of Fair Value, Fair Value Disclosure [Member] | Variable Interest Rate Swap Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 7,037	$ 5,086