DEBT - Narrative (Details) $ in Millions, $ in Millions	3 Months Ended
	Jul. 28, 2018 USD ($)	Jul. 29, 2017 USD ($)	Jul. 28, 2018 CAD ($)
Line of Credit Facility [Line Items]
Repayments of lines of credit	$ 3.6	$ 2.0
Bank of America Credit Facility
Line of Credit Facility [Line Items]
Maximum principal amount	150.0
Option to increase principal amount, additional amount (up to)	$ 100.0
Basis spread on variable rate	1.25%
Variable rate basis	LIBOR
Proceeds from borrowings	$ 0.0
Repayments in the period	2.3
Interest expense	0.3
Amount outstanding	28.0
BMO Harris Credit Facility
Line of Credit Facility [Line Items]
Maximum principal amount			$ 10.0
Option to increase principal amount, additional amount (up to)	5.0
Amount outstanding	0.0
Roynat Credit Facility
Line of Credit Facility [Line Items]
Maximum principal amount	10.0
Option to increase principal amount, additional amount (up to)	3.5
Proceeds from borrowings	0.0
Amount outstanding	2.7
Repayments of lines of credit	0.9
Line of credit, due in next 12 months	$ 0.7
Pacific Insight
Line of Credit Facility [Line Items]
Number of separate credit agreements	2
Canadian Dollar Offered Rate [Member] | BMO Harris Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
Variable rate basis	Canadian Dollar Offered Rate
Federal Funds Rate [Member] | BMO Harris Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
Variable rate basis	Federal Funds Rate
London Interbank Offered Rate (LIBOR) [Member] | BMO Harris Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Variable rate basis	LIBOR
London Interbank Offered Rate (LIBOR) [Member] | Roynat Credit Facility
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.25%
Variable rate basis	LIBOR