Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Allowance for doubtful accounts	$ 6,968	$ 6,826
Unamortized debt issuance costs	$ 2,837	$ 3,028
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	57,366,000	57,366,000
Common stock, shares outstanding	56,925,000	56,476,000
Redeemable Convertible Preferred Stock [Member]
Mezzanine equity, par value	$ 0.01	$ 0.01
Mezzanine equity, shares authorized	47,070,000	47,070,000
Mezzanine equity, shares issued	44,170,000	44,170,000
Mezzanine equity, shares outstanding	22,987,000	23,300,000