Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Line Items]
United States statutory tax rate	35.00%	35.00%	35.00%
Cash and cash equivalents held by foreign subsidiaries	$ 6,500,000
Temporary difference related to undistributed earnings	13,000,000	$ 14,400,000
Valuation allowance against net deferred tax assets	7,715,000
Canada
Income Taxes [Line Items]
Net operating loss, carryforwards	$ 13,600,000
Net operating loss, carryforwards expiration year	2033
Valuation allowance against net deferred tax assets	$ 3,700,000
Russia
Income Taxes [Line Items]
Net operating loss, carryforwards	$ 572,000
Net operating loss, carryforwards expiration year	2026
United Kingdom
Income Taxes [Line Items]
Net operating loss, carryforwards	$ 48,500
U. S.
Income Taxes [Line Items]
Valuation allowance against net deferred tax assets	$ 4,000,000