Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Related Party Transaction [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 1,473	$ 1,991
Prepaid expenses and other current assets	32,407	33,502
Related party accounts payable	$ 25,122	$ 30,133
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	118,139,282	117,744,913
Common stock, shares outstanding (in shares)	80,535,277	80,270,023
Treasury stock, shares (in shares)	37,604,005	37,474,890
Affiliated Entity
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	$ 1,651	$ 3,187
Related party accounts payable	$ 619	$ 369