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DEBT - 1.00 CONVERTIBLE NOTES (Details) - 1.00% Convertible Notes due 2018
3 Months Ended 12 Months Ended
Jul. 17, 2013
USD ($)
Jun. 18, 2013
USD ($)
label
$ / shares
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jul. 12, 2013
USD ($)
Convertible Notes          
Interest rate     1.00%    
Estimated fair value of convertible notes     $ 762,348,000    
Convertible Debt          
Convertible Notes          
Principal amount at issuance   $ 250,000,000      
Interest rate   1.00%      
Percentage of par value at which debt was issued   98.50%      
Proceeds from issuance of debt $ 283,188,000 $ 246,250,000      
Period of overallotment option to purchase additional amount of debt granted to underwriters   30 days      
Amount pertaining to exercise of over-allotment of debt by underwriters $ 37,500,000        
Initial conversion rate of common stock per $1000 of principal amount of Convertible Notes (in shares)   46.4727      
Principal amount used for debt instrument conversion ratio   $ 1,000      
Initial conversion price of convertible notes into common stock (in dollars per share) | $ / shares   $ 21.52      
Number of shares to be converted into common stock | label   13,361,000      
Converted instrument amount     44,369,000    
Estimated fair value of convertible notes         $ 225,567,000
Non-convertible borrowing rate 6.15%        
Carrying amount of the equity component of convertible notes         57,621,000
Banking, legal and accounting fees related to issuance of convertible notes         $ 2,815,000
Banking, legal and accounting fees related to issuance of convertible notes allocated to the liability component $ 2,209,000        
Banking, legal and accounting fees related to issuance of convertible notes allocated to the equity component $ 606,000        
Principal amount of Convertible Notes     223,687,000 $ 268,149,000  
The value by which Convertible Notes exceed the principal value     $ 538,661,000 $ 470,456,000  
Convertible Debt | Maximum          
Convertible Notes          
Additional amount of debt for purchase of which overallotment option is granted to underwriters   $ 37,500,000      
Convertible Debt | Conversion Terms at Holder's Option          
Convertible Notes          
Principal amount used for debt instrument conversion ratio   $ 1,000      
Target ratio of closing share price to conversion price as a condition for conversion or redemption of Convertible Notes (as a percent)   130.00% 130.00%    
Ratio of closing share price to conversion price as a condition for conversion of Convertible Notes (as a percent)   98.00%      
Convertible Debt | Conversion Terms at Holder's Option | Minimum          
Convertible Notes          
Number of trading days triggering conversion of redemption feature   20 days 20 days    
Number of trading days in the measurement period that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion feature of notes | label   5      
Convertible Debt | Conversion Terms at Holder's Option | Maximum          
Convertible Notes          
Number of trading days triggering conversion of redemption feature   30 days 30 days    
Number of trading days in the measurement period that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion feature of notes | label   10      
Convertible Debt | Conversion Terms upon Occurrence of Certain Fundamental Company Changes          
Convertible Notes          
Percentage of principal amount for computation of redemption price   100.00%      
Convertible Debt | Conversion Terms, Event of Default          
Convertible Notes          
Minimum percentage of aggregate principal amount held by bondholders to declare notes due and payable   25.00%      
In event of default arising out of certain bankruptcy events, the percentage of principal amount due and payable   100.00%