Equity Method and Other Investments - BioCision, LLC - Term Loan Receivable, Convertible Debt, and Warrant (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 28, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]
Recognized measurement gains		$ (231)
BioCision, LLC
Schedule of Equity Method Investments [Line Items]
Convertible debt securities and warrant, purchase price				$ 5,000
Loan receivable, fair value	$ 1,600
Loan receivable			$ 1,500
Annual interest rate (percent)			10.00%
Recognized measurement gains			$ 400
Loan receivable, carrying value	1,600
Convertible Debt Securities | BioCision, LLC
Schedule of Equity Method Investments [Line Items]
Investment maturity period			5 years
Annual interest rate (percent)			9.00%
Convertible debt securities, carrying value	5,800
Other Assets
Schedule of Equity Method Investments [Line Items]
Loan receivable, carrying value	1,600		$ 1,500
Other Assets | BioCision, LLC
Schedule of Equity Method Investments [Line Items]
Loan receivable, carrying value			1,500
Other Nonoperating Income (Expense) | Convertible Debt Securities
Schedule of Equity Method Investments [Line Items]
Loss on settlement of financial instruments	200
Warrants
Schedule of Equity Method Investments [Line Items]
Loss on settlement of financial instruments		$ 37
Fair Value, Measurements, Recurring | Convertible Debt Securities
Schedule of Equity Method Investments [Line Items]
Convertible debt securities, fair value			5,774
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Convertible Debt Securities
Schedule of Equity Method Investments [Line Items]
Convertible debt securities, fair value			5,774
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Convertible Debt Securities | BioCision, LLC
Schedule of Equity Method Investments [Line Items]
Convertible debt securities, fair value	5,600
Fair Value, Measurements, Recurring | Warrants
Schedule of Equity Method Investments [Line Items]
Stock warrant			45
Fair Value, Measurements, Recurring | Warrants | Significant Unobservable Inputs (Level 3)
Schedule of Equity Method Investments [Line Items]
Stock warrant			45
Fair Value, Measurements, Recurring | Warrants | Significant Unobservable Inputs (Level 3) | BioCision, LLC | Maximum
Schedule of Equity Method Investments [Line Items]
Stock warrant	$ 100		$ 100