EQUITY COMPENSATION PLANS AND SHARE-BASED COMPENSATION, Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Apr. 30, 2016
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Total intrinsic value		$ 5.2	$ 10.6
Total grant date fair value		5.0	$ 6.0
Time-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 19.4
Weighted average service period for recognition of unrecognized compensation costs		2 years 2 months 12 days
Restricted Stock Unit Activity, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)		524,000
Granted (in shares)		113,000
Vested (in shares)	[1]	(93,000)
Canceled and forfeited (in shares)		(24,000)
Nonvested, end of period (in shares)		520,000
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)	[2]	$ 45.37
Granted (in dollars per share)	[2]	44.54
Vested (in dollars per share)	[1],[2]	42.84
Canceled and forfeited (in dollars per share)	[2]	46.48
Nonvested, end of period (in dollars per share)	[2]	$ 45.59
Time-Based Restricted Stock Units [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years
Time-based vesting schedules		Four-year time-based vesting as follows: five percent vesting after the first year; additional ten percent after the second year; additional 15 percent after the third year; and the remaining 70 percent after the fourth year of continuous employment with the Company.
Vesting percentage after first year		5.00%
Additional vesting percentage after second year		10.00%
Additional vesting percentage after third year		15.00%
Additional vesting percentage after fourth year		70.00%
Time-Based Restricted Stock Units [Member] | Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Time-based vesting schedules		100 percent vesting after one year of continuous service to the Company.
Vesting percentage after first year		100.00%
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 11.6
Weighted average service period for recognition of unrecognized compensation costs		2 years 4 months 24 days
Restricted Stock Unit Activity, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)		311,000
Granted (in shares)		152,000
Vested (in shares)	[1]	(24,000)
Canceled and forfeited (in shares)		0
Nonvested, end of period (in shares)		439,000
Restricted Stock Units Activity, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested, beginning of period (in dollars per share)	[2]	$ 48.29
Granted (in dollars per share)	[2]	44.54
Vested (in dollars per share)	[1],[2]	40.82
Canceled and forfeited (in dollars per share)	[2]	0
Nonvested, end of period (in dollars per share)	[2]	$ 47.40
FY 2015 Performance RSUs [Member] | Target Condition One [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Third anniversary of the date of grant
FY 2015 Performance RSUs [Member] | Target Condition Two [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Fourth anniversary of the date of grant
FY 2015 Performance RSUs [Member] | Target Condition Three [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		>100% of target
Vesting Date		Third anniversary of the date of grant
FY 2015 Performance RSUs [Member] | Target Condition Four [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 100% of target
Vesting Date		Fourth anniversary of the date of grant
FY 2016 Performance RSUs [Member] | Target Condition One [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Third anniversary of the date of grant
FY 2016 Performance RSUs [Member] | Target Condition Two [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Fourth anniversary of the date of grant
FY 2016 Performance RSUs [Member] | Target Condition Three [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		>100% of target
Vesting Date		Third anniversary of the date of grant
FY 2016 Performance RSUs [Member] | Target Condition Four [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 100% of target
Vesting Date		Fourth anniversary of the date of grant
FY 2017 Performance RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approved restricted stock unit awards (performance vesting) (in shares)				152,000
FY 2017 Performance RSUs [Member] | Target Condition One [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Third anniversary of the date of grant
FY 2017 Performance RSUs [Member] | Target Condition Two [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Fourth anniversary of the date of grant
FY 2017 Performance RSUs [Member] | Target Condition Three [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		>100% of target
Vesting Date		Third anniversary of the date of grant
FY 2017 Performance RSUs [Member] | Target Condition Four [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		25.00%
Consolidated Income from Operations		> 100% of target
Vesting Date		Fourth anniversary of the date of grant
FY2017 Performance RSUs for CEO [Member] | Target Condition One [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		18.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Third anniversary of the date of grant
FY2017 Performance RSUs for CEO [Member] | Target Condition Two [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		18.00%
Consolidated Income from Operations		> 90% of target
Vesting Date		Fourth anniversary of the date of grant
FY2017 Performance RSUs for CEO [Member] | Target Condition Three [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		32.00%
Consolidated Income from Operations		>100% of target
Vesting Date		Third anniversary of the date of grant
FY2017 Performance RSUs for CEO [Member] | Target Condition Four [Member]
Performance target of restricted stock units by vesting date [Abstract]
Shares issuable upon settlement		32.00%
Consolidated Income from Operations		> 100% of target
Vesting Date		Fourth anniversary of the date of grant

[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.