Goodwill (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill
Balance at the beginning of the period	$ 45,134
Translation adjustments	55
Balance at the end of the period	45,189
CAG
Goodwill
Balance at the beginning of the period	21,403
Translation adjustments	55
Balance at the end of the period	21,458
GovDeals
Goodwill
Balance at the beginning of the period	23,731
Translation adjustments	0
Balance at the end of the period	$ 23,731