Description of the Business (Narrative) (Details) (USD $) Share data in Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2013
Description Of Business Narrative Details
Approximate number of business customers	36800
Year Founded	1987
Entity Incorporation, Date of Incorporation	Dec. 31, 1996
Entity Incorporation, State Country Name	Delaware
Fiscal Year End Date	--03-31
Common stock issued, shares	14,375
Net proceeds from sale of common stock	$ 125,800,000
Common shares puchased by member of board of directors	30
Value of securities in shelf registration statement previously filed	$ 250,000,000