Fair Value Measurements (Tables)

6 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis [Table Text Block]

Assets and liabilities measured at fair value on a recurring basis at September 30, 2014 and March 31, 2014 are categorized in the tables below based on the lowest level of significant input to the valuation. During the periods presented, there were no transfers between fair value hierarchical levels.

	Balance at		Quoted prices in active markets Level 1		Significant other observable inputs Level 2		Significant unobservable inputs Level 3
(In thousands)	September 30, 2014
Assets:
Deferred compensation plan assets	$	15,614	$	15,614	$	—	$	—
Liabilities:
Deferred compensation plan liabilities	$	15,614	$	15,614	$	—	$	—

	Balance at		Quoted prices in active markets Level 1		Significant other observable inputs Level 2		Significant unobservable inputs Level 3
(In thousands)	March 31, 2014
Assets:
Deferred compensation plan assets	$	16,387	$	16,387	$	—	$	—
Liabilities:
Deferred compensation plan liabilities	$	16,387	$	16,387	$	—	$	—
Contingent consideration liabilities	323		—		—		323
Total liabilities measured at fair value on a recurring basis	$	16,710	$	16,387	$	—	$	323

Fair Value Of Debt [Table Text Block]

	Carrying Value at	Fair Value at	Carrying Value at	Fair Value at
(In thousands)	September 30, 2014	September 30, 2014	March 31, 2014	March 31, 2014
4.50% senior notes due 2014	—	—	399,952	407,092
3.25% senior notes due 2015	249,925	255,218	249,887	258,630
2.95% senior notes due 2016	249,883	257,440	249,848	259,257
1.65% senior notes due 2018	324,634	320,603	324,579	319,098
2.375% senior notes due 2020	274,770	270,421	274,748	265,600
2.90% senior notes due 2022	249,773	240,295	249,760	233,230
3.65% senior notes due 2024	299,432	300,459	—	—