DEBT (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended					1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Convertible notes due 2019, net	Jun. 30, 2013 Convertible notes due 2019, net item	Jun. 30, 2012 Convertible notes due 2019, net	Jun. 30, 2013 Revolving credit facility	Jun. 30, 2013 Revolving credit facility Minimum	Jun. 30, 2013 Revolving credit facility Maximum	Jun. 30, 2012 Term loan
Long-term debt disclosure
Total debt, non-current	$ 302,263,000	$ 293,248,000		$ 293,248,000	$ 302,263,000	$ 293,248,000
Aggregate principal amount of convertible senior notes issued				370,000,000
Interest rate on convertible senior notes (as a percent)					2.875%
Net proceeds after deducting underwriting discounts, commission and offering expenses				359,000,000
Repayment of outstanding amounts under term loan facility										110,600,000
Principal amount of notes used for debt instrument conversion					1,000
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable					20
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable					30 days
Convertibility of debt, closing price of stock test, percentage of stock price to conversion price that must be exceeded					130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period					5 days
Number of consecutive trading days before five consecutive business days during the note measurement period					5 days
Convertibility of debt, trading price of debt test, percentage of closing price of stock used in calculation					98.00%
Convertibility of debt, trading price of debt test, percentage of closing price of stock used in calculation				0.0094955
Initial conversion price per share of common stock (in dollars per share)	$ 105.31			$ 105.31		$ 105.31
Number of underlying shares for conversion				3.5
Principal amount of notes to be settled in cash upon conversion					1,000
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable					20
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable					30 days
Number of trading days immediately prior to the date of redemption price considered for redemption of notes payable					10 days
Redemption of debt, closing price of stock test, percentage of stock price to conversion price that must be exceeded					130.00%
Redemption price as percentage of principal amount					100.00%
Ratio for additional redemption price of debt instrument					0.09
Redemption price as percentage of principal amount required by holders upon occurrence of certain fundamental changes					100.00%
Estimated fair value of liability component of convertible notes at issuance date				293,000,000		293,000,000
Amount of equity component of convertible notes				77,000,000		77,000,000
Amortization period for debt discount				7 years
Effective interest rate to amortize debt discount (as percent)				6.64%
Debt issuance costs				11,000,000
Net carrying amount of liability component of convertible notes				293,200,000	302,300,000	293,200,000
Interest expense recognized					20,700,000	600,000
Interest payments on notes	10,490,000	4,590,000	5,378,000		10,500,000	0
Maximum availability under the revolving credit facility							350,000,000
Revolving credit facility, description of interest rate basis							LIBOR
Revolving credit facility, basis spread on interest rate (as a percent)							1.75%	1.75%	3.00%
Outstanding amount under credit facility							$ 0
Leverage ratio, maximum							3.0