Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Allowance for doubtful accounts	$ 29,149	$ 27,016
Preferred stock, shares authorized	20,030	20,030
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	87,608	87,554
Treasury stock, shares	13,034	12,197