Accounts Receivable - Current Portion of Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	$ 191,222	$ 157,577
Less allowance for doubtful accounts	(8,153)	(8,297)
Total accounts receivable, less allowance for doubtful accounts	183,069	149,280
Billed
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	114,161	90,194
Unbilled
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	72,735	64,954
Retainage
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	$ 4,326	$ 2,429