Other Balance Sheet Information - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) triggering_event	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2012 USD ($)
Debt Instrument [Line Items]
Reserves for excess and obsolete inventory	$ 24,300,000		$ 24,300,000		$ 24,800,000
Capitalized computer software costs			600,000
Note receivable, face value	$ 200,000		200,000		200,000
Initial value of notes receivable						$ 3,000,000
Note receivable, interest rate						9.00%
Impairment charge					3,400,000
Number of triggering events | triggering_event	0
Other Assets
Debt Instrument [Line Items]
Deferred finance costs, net	$ 600,000		600,000		700,000
Property, Plant and Equipment
Debt Instrument [Line Items]
Capitalized computer software, gross	4,300,000		4,300,000		$ 3,700,000
Interest Expense
Debt Instrument [Line Items]
Amortization (less than)	$ 100,000	$ 0	$ 100,000	$ 0