Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Jan. 25, 2020	Jul. 27, 2019	Jan. 26, 2019	Jul. 28, 2018	Jan. 25, 2020	Jan. 26, 2019
Activity in accumulated other comprehensive loss
Beginning balance	$ 710,742	$ 696,976	$ 649,231	$ 625,216	$ 696,976	$ 625,216
Changes before reclassifications	91		872		1,598	(1,806)
Reclassification of certain income tax effects/Cumulative effect adjustment for investments					(547)	(1,637)
Amounts reclassified to net income	35		828		150	2,313
Tax effect	(19)		(225)		(100)	(525)
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	107		1,475		1,101	(1,655)
Ending balance	729,482	698,138	671,786	626,664	729,482	671,786
Components of non-controlling interest
Balance as of the beginning of the period	15,543	14,468	13,411	13,035	14,468	13,035
Net income	204		443		434	1,428
Other comprehensive income (loss)	(162)		669		683	60
Balance as of the end of the period	15,585		14,523		15,585	14,523
ASU 2016-01 - Investments
Activity in accumulated other comprehensive loss
Reclassification of certain income tax effects/Cumulative effect adjustment for investments				0
Translation adjustment
Activity in accumulated other comprehensive loss
Beginning balance	1,345	50	(24)	2,388	50	2,388
Changes before reclassifications	50		800		1,345	(1,612)
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	50		800		1,345	(1,612)
Ending balance	1,395		776		1,395	776
Change in fair value of cash flow hedge
Activity in accumulated other comprehensive loss
Beginning balance	0	87	(24)	154	87	154
Changes before reclassifications			0			(369)
Reclassification of certain income tax effects/Cumulative effect adjustment for investments					(97)
Amounts reclassified to net income	0		93		14	225
Tax effect	0		(23)		(4)	36
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	0		70		(87)	(108)
Ending balance	0		46		0	46
Unrealized gain (loss) on marketable securities
Activity in accumulated other comprehensive loss
Beginning balance	418	6	(197)	1,376	6	1,376
Changes before reclassifications	41		72		253	175
Reclassification of certain income tax effects/Cumulative effect adjustment for investments					258	(1,637)
Amounts reclassified to net income	(20)		48		(28)	29
Tax effect	(5)		(30)		(55)	(50)
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	16		90		428	(1,483)
Ending balance	434		(107)		434	(107)
Unrealized gain (loss) on marketable securities | ASU 2016-01 - Investments
Activity in accumulated other comprehensive loss
Reclassification of certain income tax effects/Cumulative effect adjustment for investments						1,600
Cumulative effect on retained earnings, tax						500
Cumulative effect on retained earnings, before tax						2,100
Net pension amortization and net actuarial loss
Activity in accumulated other comprehensive loss
Beginning balance	(4,231)	(3,605)	(28,084)	(29,117)	(3,605)	(29,117)
Reclassification of certain income tax effects/Cumulative effect adjustment for investments					(708)
Amounts reclassified to net income	55		687		164	2,059
Tax effect	(14)		(172)		(41)	(511)
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	41		515		(585)	1,548
Ending balance	(4,190)		(27,569)		(4,190)	(27,569)
Accumulated other comprehensive loss
Activity in accumulated other comprehensive loss
Beginning balance	(2,468)	(3,462)	(28,329)	(25,199)	(3,462)	(25,199)
Ending balance	$ (2,361)	$ (3,728)	$ (26,854)	(29,573)	$ (2,361)	$ (26,854)
Accumulated other comprehensive loss | ASU 2016-01 - Investments
Activity in accumulated other comprehensive loss
Reclassification of certain income tax effects/Cumulative effect adjustment for investments				$ (1,637)