Condensed Combined and Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Other comprehensive income (loss) Pre- Tax Amount :
Net income	$ 131.6	$ 161.9	$ 390.7	$ 373.4
Reclassification for pension and post-employment benefit obligations included in net income		(5.3)		(5.3)
Unrealized pension and post-employment benefit obligations		0.5		7.2
Unrealized currency translation gains (losses)	2.8	1.0	(10.2)	(9.4)
Comprehensive income (loss)	134.4	158.1	380.5	365.9
Less: Comprehensive income attributable to noncontrolling interests	3.4	1.3	10.7	6.5
Comprehensive income (loss) attributable to Lamb Weston	131.0	156.8	369.8	359.4
Other comprehensive income (loss) Tax (Expense) Benefit :
Net income	(44.0)	(53.2)	(129.0)	(124.2)
Reclassification for pension and post-employment benefit obligations included in net income		1.3		1.3
Unrealized pension and post-employment benefit obligations		(0.1)		(1.8)
Comprehensive income (loss)	(44.0)	(52.0)	(129.0)	(124.7)
Comprehensive income (loss) attributable to Lamb Weston	(44.0)	(52.0)	(129.0)	(124.7)
Other comprehensive income (loss) After Tax Amount :
Net income	87.6	108.7	261.7	249.2
Reclassification for pension and post-employment benefit obligations included in net income		(4.0)		(4.0)
Unrealized pension and post-employment benefit obligations		0.4		5.4
Unrealized currency translation gains (losses)	2.8	1.0	(10.2)	(9.4)
Comprehensive income (loss)	90.4	106.1	251.5	241.2
Less: Comprehensive income attributable to noncontrolling interests	3.4	1.3	10.7	6.5
Comprehensive income (loss) attributable to Lamb Weston	$ 87.0	$ 104.8	$ 240.8	$ 234.7