Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Sep. 30, 2015 USD ($) $ / shares $ / RUB $ / COP shares	Sep. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2013 USD ($) $ / shares shares
Significant Accounting Policies [Line Items]
Minimum credit limit	30 days
Extended credit terms for trade receivables	60 days
Percentage of increase decrease in foreign currency exchange rate	10.00%
Issuance of restricted stock, Shares | shares	3,000	197,000	0
Weighted average grant date fair value per Share | $ / shares	$ 19.13	$ 95.18	$ 0
Stock options granted during fiscal years | shares	0	0	0
Stock-based compensation expense	$ 4,500,000	$ 4,100,000	$ 500,000
Shipping and handling costs	600,000	$ 900,000	$ 1,400,000
Russian Subsidiary
Significant Accounting Policies [Line Items]
Net working capital related to this subsidiary	$ 3,400,000
Foreign exchange rate | $ / RUB	65.4
Decline of net working capital	$ 300,000
Colombian Subsidiary
Significant Accounting Policies [Line Items]
Net working capital related to this subsidiary	$ 400,000
Foreign exchange rate | $ / COP	3,116
Decline of net working capital	$ 39,000
Customer Concentration Risk | No customers | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Percentage of company revenue	10.00%
Customer Concentration Risk | Customer one | Sales Revenue, Net
Significant Accounting Policies [Line Items]
Percentage of company revenue		26.40%	36.50%