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Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail)
$ in Thousands
12 Months Ended
Sep. 30, 2016
USD ($)
Income Tax Disclosure [Abstract]  
Unrecognized tax benefits as of October 2, 2015 $ 10,583
Gross decrease due to prior period adjustments (475)
Gross increase due to current period adjustments 1,475
Gross decrease due to settlements with taxing authorities (2,068)
Gross decrease due to a lapse with taxing authorities (2,889)
Total change in unrecognized gross benefit (3,957)
Unrecognized tax benefits as of September 30, 2016 6,626
Unrecognized tax benefits that, if recognized, would impact the effective tax rate 6,626
Statement of operations:  
Total amount of interest income (expense) included in income tax expense (308)
Recognized in the statement of financial position:  
Total amount of accrued interest included in income taxes payable $ 583