Commitments and Contingencies Minimum Future Lease Payments for Non-Cancelable Leases (Details) - USD ($)				9 Months Ended
	Jul. 24, 2017	Jun. 30, 2017	Jul. 25, 2016	Sep. 30, 2017	Jul. 28, 2017	Jun. 05, 2017	Jul. 14, 2016
Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract]
Remainder of 2017				$ 3,072,000
2018				12,785,000
2019				11,164,000
2020				8,503,000
2021				7,435,000
Thereafter				13,558,000
Total minimum lease payments				56,517,000
Other Commitments [Line Items]
Software				50,000,000
Software term		3 years
Commitments To Purchase Convertible Promissory Notes With Private Company
Other Commitments [Line Items]
Commitment				5,000,000.0
First note							$ 2,000,000.0
Second note						$ 2,000,000
Third note				$ 1,000,000
Maturity date				Dec. 30, 2018
Interest				2.50%
SDC
Other Commitments [Line Items]
Borrowing base as a percentage of accounts receivable			80.00%
Stated rate			7.00%
Advances outstanding				$ 17,000,000
Maximum | SDC
Other Commitments [Line Items]
Loan facility	$ 30,000,000.0		$ 15,000,000.0
Belen Business Center
Other Commitments [Line Items]
Consideration	$ 26,100,000
First deposit					$ 5,200,000