STOCK-BASED COMPENSATION Stock Option Activity (Details) (Stock Options [Member], USD $) Share data in Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at March 31, 2012	3,304
Options granted	428
Options exercised	(444)
Options forfeited or expired	(143)
Options outstanding at December 31, 2012	3,145
Weighted average exercise price of options outstanding, March 31, 2012	$ 26.47
Weighted average exercise price of options granted	$ 33.23
Weighted average exercise price of options exercised	$ 23.89
Weighted average exercise price of options forfeited or expired	$ 34.81
Weighted average exercise price of options outstanding, December 31, 2012	$ 27.38
Weighted average remaining contractual life of options outstanding at December 31, 2012	3 years 219 days
Aggregate intrinsic value of options outstanding at December 31, 2012	$ 27,472,000
Vested and expected to vest at December 31, 2012	3,107
Weighted average exercise price of options vested and expected to vest at December 31, 2012	$ 27.30
Weighted average remaining contractual life of options vested and expected to vest at December 31, 2012	3 years 219 days
Aggregate intrinsic value of options vested and expected to vest at December 31, 2012	27,372,000
Exercisable at December 31, 2012	2,294
Weighted average exercise price of options exercisable at December 31, 2012	$ 24.98
Weighted average remaining contractual life of options exercisable at December 31, 2012	2 years 256 days
Aggregate intrinsic value of options exercisable at December 31, 2012	25,355,000
Total intrinsic value of options exercised	5,100,000	18,600,000
Total cash received as a result of stock option exercises, net of taxes	10,600,000
Total unrecognized compensation cost related to unvested stock options	$ 8,100,000
Weighted average period of recognition for unrecognized compensation cost related to unvested stock options	2 years 37 days

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.