Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	$ 16,300	$ 16,400
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	16,300	16,400
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	16,288	16,387
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	16,288	16,387
Fair Value, Measurements, Recurring [Member] | Quoted prices in active markets Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Deferred compensation plan assets	16,288	16,387
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liabilities	16,288	16,387
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | 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