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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Mar. 26, 2016
Investment Company, Capital Share Transactions [Abstract]      
Payments for fees $ 0.2 $ 0.2 [1] $ 0.2 [1]
[1] Retrospectively revised (see note 18)