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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 28, 2017
Jan. 30, 2016
Income Tax Disclosure [Abstract]        
Income tax expense $ 6.6 $ 5.5 $ 18.3 $ 18.6
Effective income tax rate 21.80% 24.20% 20.80% 23.10%