Stockholders' Equity (Gross And Net Changes In And The Balances Within Each Component Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2011	Mar. 31, 2011
Class of Stock [Line Items]
Stockholders' Equity Attributable to Parent	$ 1,649,140	$ 1,734,882
Balance at March 31, 2011	7,580
Foreign currency translation adjustments	(5,023)
Reclassification adjustments to income	388
Reclassification adjustments to income	388
Tax effect of comprehensive income items	(144)
Net change after tax of comprehensive income items	(4,779)
Balance at December 31, 2011	2,801
Foreign Currency Translation Adjustment [Member]
Class of Stock [Line Items]
Balance at March 31, 2011	9,047
Net change after tax of comprehensive income items	(5,023)
Balance at December 31, 2011	4,024
Interest Rate Lock Commitments [Member]
Class of Stock [Line Items]
Balance at March 31, 2011	(1,467)
Net change after tax of comprehensive income items	244
Balance at December 31, 2011	(1,223)
Accumulated Other Comprehensive Income (Loss) [Member]
Class of Stock [Line Items]
Stockholders' Equity Attributable to Parent	2,801	7,580
Foreign currency translation adjustments	$ (5,023)