Accounts Receivable - Current Portion of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	$ 176,850	$ 157,577
Less allowance for doubtful accounts	(8,384)	(8,297)
Total accounts receivable, less allowance for doubtful accounts	168,466	149,280
Billed
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	101,430	90,194
Unbilled
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	72,370	64,954
Retainage
Accounts Receivable, Net, Current [Abstract]
Total accounts receivable - gross	$ 3,050	$ 2,429