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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2016
Jul. 31, 2017
Jan. 31, 2017
Oct. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items]          
Goodwill     $ 1,022.7 $ 996.4  
Herndon          
Business Combination, Separately Recognized Transactions [Line Items]          
Accounts receivable-trade         $ 12.3
Inventories         103.8
Other current and non-current assets         3.7
Property and equipment         2.1
Goodwill         50.7
Identified intangibles         68.9
Accounts payable         (9.7)
Other current and non-current liabilities         (11.0)
Total consideration paid         $ 220.8
Pro forma          
Unaudited pro forma revenues $ 385.0 $ 782.0      
Unaudited pro forma net earnings (loss) $ 8.4 $ 14.0      
Unaudited pro forma diluted net earnings (loss) per share $ 0.16 $ 0.27