Stock-Based Compensation (ESPP - Purchase Option Activity) (Details) (Employee Stock Purchase Plan [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Dec. 31, 2013
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at the beginning of period, Number Of Stock Options	62
Granted, Number Of Stock Options	207
Exercised, Number Of Stock Options	(166)
Outstanding at the end of period, Number Of Stock Options	103
Outstanding at the beginning of period, Weighted-Average Exercise Price Per Share	$ 68.74
Granted, Weighted-Average Exercise Price Per Share	$ 82.88
Exercised, Weighted-Average Exercise Price Per Share	$ 78.34
Outstanding at the end of period, Weighted-Average Exercise Price Per Share	$ 81.64