Combined and Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Other comprehensive income (loss) Pre- Tax Amount :
Net income	$ 510.4	$ 439.1	$ 418.0
Reclassification of pension and post-retirement benefits out of accumulated other comprehensive income (loss)	0.0	(5.3)	0.0
Unrealized pension and post-employment benefit obligations	1.6	7.2	3.9
Unrealized currency translation losses	(1.1)	(5.5)	(28.7)
Comprehensive income (loss)	510.9	435.5	393.2
Less: Comprehensive income attributable to noncontrolling interests	13.3	9.3	9.3
Comprehensive income (loss) attributable to Lamb Weston	497.6	426.2	383.9
Other comprehensive income (loss) Tax (Expense) Benefit :
Net income	(170.2)	(144.5)	(140.4)
Reclassification for pension and post-employment benefit obligations included in net income		1.3
Unrealized pension and post-employment benefit obligations	(0.6)	(1.8)	(1.0)
Comprehensive income (loss)	(170.8)	(145.0)	(141.4)
Comprehensive income (loss) attributable to Lamb Weston	(170.8)	(145.0)	(141.4)
Other comprehensive income (loss) After Tax Amount :
Net income	340.2	294.6	277.6
Reclassification of pension and post-retirement benefits out of accumulated other comprehensive income (loss)		(4.0)
Unrealized pension and post-employment benefit obligations	1.0	5.4	2.9
Unrealized currency translation gains (losses)	(1.1)	(5.5)	(28.7)
Comprehensive income (loss)	340.1	290.5	251.8
Less: Comprehensive income attributable to noncontrolling interests	13.3	9.3	9.3
Comprehensive income (loss) attributable to Lamb Weston	$ 326.8	$ 281.2	$ 242.5