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Income Taxes (Details 3)
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Income Taxes Details 3      
Statutory income tax 34.00% 20.00% 20.50%
State taxes (net of federal) 1.90%
Tax effect of permanent differences 2.80% (4.00%) (2.20%)
ATCA interest disallowed (3.30%) (13.20%) (14.70%)
Movement in provisions 0.10% 0.10%
Effect of foreign taxes (15.10%) (0.50%) (0.90%)
Rate change 0.20%
Transfer pricing adjustments (0.20%)
Valuation allowance (20.70%) (2.90%) (3.80%)
Effective income tax rate (0.40%) (0.50%) (1.00%)