Acquisition of Versature Corp (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Acquisition of Versature Corp [Abstract]
Revenues	$ 349,473	$ 397,362	$ 712,673	$ 792,284
Net income (loss)	$ 489	$ 1,641	$ (867)	$ (319)