Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	$ 15,736	$ 16,288
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	15,736	16,288
Quoted Prices In Active Markets Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	15,736	16,288
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	15,736	16,288
Significant Other Observable Inputs Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	0	0
Significant Unobservable Inputs Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	$ 0	$ 0