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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Statement of Comprehensive Income [Abstract]    
Changes in unrealized holding gains and losses on available-for-sale securities. tax $ 1.5 $ 0.0
Changes in value of hedged interest rate caps, tax $ 0.5 $ 0.2