Fair Value Measurements - Reconciliation of Assets and Liabilities Measured Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands		6 Months Ended
	Nov. 28, 2016	Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total, period start		$ 6,319
Change in fair value		(231)
Settlements		6,088
Total, period end		0
Convertible Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2016		5,774
Change in fair value	$ (200)	(194)
Settlements	$ (5,600)	(5,580)
Balance at March 31, 2017		0
Stock Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2016		45
Change in fair value		(37)
Settlements		(8)
Balance at March 31, 2017		0
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at September 30, 2016		500
Change in fair value		0
Settlements		(500)
Balance at March 31, 2017		$ 0