Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Note 12 - Restructuring Activity (Details Textual) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended				9 Months Ended
	Dec. 29, 2017	Sep. 30, 2016	Jun. 29, 2018	Mar. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 29, 2018	Jun. 30, 2017
Restructuring Charges, Total			$ 0		$ 0		$ 264	$ 386
Contract Termination [Member] \| Lease Amending Agreement Surrender Agreement [Member]
Restructuring Charges, Total				$ 200
Reston Town Center Facility [Member]
Restructuring and Related Activities, Renewed Sublease Surplus Space		81.00%
Restructuring Charges, Total	$ 100	$ 1,900				$ 400
Subleased Surplus Space, Percentage			40.00%				40.00%