STOCK-BASED COMPENSATION - Restricted Stock Unit and Performance-based Restricted Stock Unit (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Aug. 27, 2017 USD ($) $ / shares shares
Stock-based Compensation
Aggregate fair value of awards vested | $	$ 13.0
Stock-settled restricted stock units
Shares
Outstanding at beginning of the period (in shares) | shares	489,604
Granted (in shares) | shares	250,283
Vested (in shares) | shares	(113,738)
Outstanding at end of the period (in shares) | shares	626,149
Weighted-Average Grant-Date Fair Value
Outstanding at beginning of the period (in dollars per share) | $ / shares	$ 26.92
Granted (in dollars per share) | $ / shares	43.83
Vested (in dollars per share) | $ / shares	20.60
Outstanding at end of the period (in dollars per share) | $ / shares	$ 34.83
Cash-settled restricted stock units
Shares
Outstanding at beginning of the period (in shares) | shares	462,612
Vested (in shares) | shares	(168,233)
Forfeited/expired/cancelled (in shares) | shares	(2,370)
Outstanding at end of the period (in shares) | shares	292,009
Weighted-Average Grant-Date Fair Value
Outstanding at beginning of the period (in dollars per share) | $ / shares	$ 25.33
Vested (in dollars per share) | $ / shares	19.69
Forfeited/expired/cancelled (in dollars per share) | $ / shares	27.03
Outstanding at end of the period (in dollars per share) | $ / shares	$ 28.56
Performance Shares
Shares
Outstanding at beginning of the period (in shares) | shares	57,690
Granted (in shares) | shares	171
Performance condition adjustment | shares	(818)
Vested (in shares) | shares	(15,228)
Outstanding at end of the period (in shares) | shares	41,815
Weighted-Average Grant-Date Fair Value
Outstanding at beginning of the period (in dollars per share) | $ / shares	$ 25.84
Granted (in dollars per share) | $ / shares	45.99
Performance condition adjustment (in dollars per share) | $ / shares	19.70
Vested (in dollars per share) | $ / shares	19.70
Outstanding at end of the period (in dollars per share) | $ / shares	$ 28.28