Employee Benefit Plans, Net Periodic Benefit Cost, Liability Rollforward, Balance Sheet and Amounts Recognized in Accumulated Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Unfunded liability recognized in accrued expenses	$ 194		$ 198
Components of net pension cost [Abstract]
Interest cost	210	$ 296
Expected return on plan assets	(249)	(289)
Amortization of net loss	89	77
Net periodic benefit cost	50	84
Net cost of defined contribution plans	110	155
Net cost of all employee benefit plans	160	239
Movement in liability for pension benefits [Roll forward]
Liability for pension benefits at beginning of period	11,511
Interest cost	210	296
Expected return on plan assets	(249)	$ (289)
Plan contributions	(143)
Effect of exchange rate changes	(550)
Liability for pension benefits at end of period	10,779
U.S. Defined Benefit Plan [Member]
Estimated future employer contributions [Abstract]
Employer contributions	50
Estimated future employer contributions in current fiscal year	150
U.K. Defined Benefit Plan [Member]
Estimated future employer contributions [Abstract]
Employer contributions	93
Estimated future employer contributions in current fiscal year	648
Bassi S.r.l. Unipersonale [Member]
Defined Benefit Plan Disclosure [Line Items]
Unfunded liability recognized in accrued expenses	$ 965		$ 987