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Other Financial Statements Details - Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Inventory [Line Items]      
Raw materials $ 80.6   $ 26.0
Work in process 455.6   311.8
Finished goods 300.5   138.4
Total inventories 836.7 $ 471.1 $ 476.2
Microsemi Corporation | Fair value adjustment to inventory      
Inventory [Line Items]      
Total inventories $ 120.1