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BALANCE SHEET COMPONENTS - Available-for-Sale Securities (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 30, 2016
Dec. 29, 2016
Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost $ 60.0   $ 95.3
Gross Unrealized Gains 0.0   0.0
Gross Unrealized Losses 0.0   0.0
Fair Value 60.0   95.3
CPTC loans      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost 60.0   95.3
Gross Unrealized Gains 0.0   0.0
Gross Unrealized Losses 0.0   0.0
Fair Value 60.0   95.3
CPTC loans      
Schedule of Available-for-sale Securities [Line Items]      
Amortized cost 60.0    
Fair Value 60.0 $ 98.1 $ 95.3
Impairment charges 38.3    
Other loan related charges $ 0.2