SCHEDULE I-CONDENSED FINANCIAL INFORMATION OF REGISTRANT – CONDENSED BALANCE SHEETS (Details) - $ / shares shares in Thousands	Dec. 31, 2017	Dec. 31, 2016
CONDENSED BALANCE SHEETS
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, Authorized shares	10,000	10,000
Preferred stock, Issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Authorized shares	100,000	100,000
Common stock, Issued shares	52,973	51,993
Common stock, outstanding shares	24,202	23,517
Ordinary common stock in treasury, shares	28,771	28,476
Magellan Health, Inc.
CONDENSED BALANCE SHEETS
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, Authorized shares	10,000	10,000
Preferred stock, Issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Authorized shares	100,000	100,000
Common stock, Issued shares	52,973	51,993
Common stock, outstanding shares	24,202	23,517
Ordinary common stock in treasury, shares	28,771	28,476