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	12 Months Ended						1 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2012 Convertible notes due 2019 D	Jun. 30, 2012 Convertible notes due 2019	May 31, 2012 Revolving credit facility	Jun. 30, 2012 Revolving credit facility	Jun. 30, 2011 Revolving credit facility	Jun. 30, 2012 Revolving credit facility Minimum	Jun. 30, 2012 Revolving credit facility Maximum	May 30, 2012 Revolving credit facility Before amendment	May 30, 2012 Revolving credit facility After amendment	Jun. 30, 2012 Term loan	Jun. 30, 2012 Term loan	Jun. 30, 2011 Term loan
Long-term debt disclosure
Total debt, current		$ 15,600,000													$ 15,600,000
Total debt, non-current	293,248,000	210,500,000		293,248,000	293,248,000			100,000,000							110,500,000
Aggregate principal amount of convertible senior notes issued				370,000,000
Interest rate on convertible senior notes (as a percent)				2.875%	2.875%
Net proceeds after 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 ratio				1,000	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
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
Number of consecutive trading days before five consecutive business days during the note measurement period				5
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				1,000	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
Number of trading days immediately prior to the date of redemption price considered for redemption of notes payable				10
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%	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	293,200,000
Interest expense recognized				600,000
Maximum availability under the revolving credit facility											225,000,000	350,000,000
Additional maximum availability under the revolving credit facility						125,000,000
Accordion feature to increase commitments under the Revolving Credit Facility						50,000,000
Revolving credit facility, description of interest rate basis							LIBOR
Revolving credit facility, basis spread on interest rate (as a percent)							1.875%		1.75%	2.25%
Leverage ratio, maximum							3.0
Interest coverage ratio, minimum							3.0
Current ratio, minimum							1.5
Debt service coverage ratio, minimum							1.25
Repayment of debt	$ 326,100,000	$ 41,900,000	$ 55,263,000											$ 110,600,000