EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION, Restricted Stock Units (Details) (USD $)	3 Months Ended			6 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value	$ 3,400,000		$ 2,400,000	$ 11,100,000		$ 12,900,000
Total grant date fair value	1,700,000		1,500,000	7,100,000		6,900,000
Time-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	19,500,000			19,500,000
Weighted average service period for recognition of unrecognized compensation costs				2 years
Restricted Stock Unit Activity, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)				774,000
Granted (in shares)				179,000
Vested (in shares)				(262,000)	[1]
Canceled and forfeited (in shares)				(4,000)
Nonvested, end of period (in shares)	687,000			687,000
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)				$ 30.98	[2]
Granted (in dollars per share)				$ 43.44	[2]
Vested (in dollars per share)				$ 27.11	[1],[2]
Canceled and forfeited (in dollars per share)				$ 31.02	[2]
Nonvested, end of period (in dollars per share)	$ 35.69	[2]		$ 35.69	[2]
Time-Based Restricted Stock Units [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage after first year (in hundredths)				5.00%
Additional vesting percentage after second year (in hundredths)				10.00%
Additional vesting percentage after third year (in hundredths)				15.00%
Additional vesting percentage after fourth year (in hundredths)				70.00%
Time-Based Restricted Stock Units [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage after first year (in hundredths)				100.00%
Performance RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	5,000,000			5,000,000
Weighted average service period for recognition of unrecognized compensation costs				3 years 1 month 6 days
Restricted Stock Unit Activity, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)				113,000
Granted (in shares)				172,000
Vested (in shares)				0	[1]
Canceled and forfeited (in shares)				(137,000)
Nonvested, end of period (in shares)	148,000			148,000
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)				$ 42.43	[2]
Granted (in dollars per share)				$ 40.82	[2]
Vested (in dollars per share)				$ 0	[1],[2]
Canceled and forfeited (in dollars per share)				$ 42.15	[2]
Nonvested, end of period (in dollars per share)	$ 40.82	[2]		$ 40.82	[2]
FY 2014 Performance RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved restricted stock unit awards (performance vesting) (in shares)	129,000			129,000
Aggregate estimated grant date fair value	5,500,000			5,500,000
Aggregate estimated grant date fair value (in dollars per share)	$ 42.43			$ 42.43
FY 2014 Performance RSUs [Member] | Target/Service Condition One [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				> 90% of target
Vesting Date				Apr. 29, 2016
FY 2014 Performance RSUs [Member] | Target/Service Condition Two [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				> 90% of target
Vesting Date				Apr. 29, 2017
FY 2014 Performance RSUs [Member] | Target/Service Condition Three [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				>100% of target
Vesting Date				Apr. 29, 2016
FY 2014 Performance RSUs [Member] | Target/Service Condition Four [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				> 100% of target
Vesting Date				Apr. 29, 2017
FY2015 Performance RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved restricted stock unit awards (performance vesting) (in shares)	172,000			172,000
Aggregate estimated grant date fair value	$ 7,000,000			$ 7,000,000
Aggregate estimated grant date fair value (in dollars per share)	$ 40.82			$ 40.82
FY2015 Performance RSUs [Member] | Target/Service Condition One [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				> 90% of target
Vesting Date				Apr. 28, 2017
FY2015 Performance RSUs [Member] | Target/Service Condition Two [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				> 90% of target
Vesting Date				Apr. 28, 2018
FY2015 Performance RSUs [Member] | Target/Service Condition Three [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				>100% of target
Vesting Date				Apr. 28, 2017
FY2015 Performance RSUs [Member] | Target/Service Condition Four [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares Issuable Upon Settlement (in hundredths)				25.00%
Consolidated Income from Operations				> 100% of target
Vesting Date				Apr. 28, 2018

[1] The number of restricted stock units vested includes shares that we withheld on behalf of our employees to satisfy the statutory tax withholding requirements.

[2] The weighted average grant date fair value of restricted stock units is based on the number of shares and the closing market price of our common stock on the date of grant.