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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Income Tax Disclosure [Abstract]        
Income Tax Expense $ 4.9 $ 6.2 $ 9.2 $ 11.7
Effective income tax rate 16.80% 19.90% 17.10% 20.20%