Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Mar. 31, 2018
Condensed Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	450,000,000	450,000,000
Common stock, shares issued	58,849,713	58,640,161
Common stock, shares outstanding (net of treasury stock)	55,157,193	55,090,165
Treasury stock, shares at cost	3,692,520	3,549,996