Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jan. 26, 2019	Jul. 28, 2018	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Activity in accumulated other comprehensive loss
Balance		$ 612,181		$ 612,181
Balance	$ 657,263			657,263
Components of non-controlling interest
Balance as of the beginning of the period	13,411	13,035	$ 12,094	13,035	$ 11,186
Net income	443		176	1,428	579
Other comprehensive income	669		689	60	1,194
Balance as of the end of the period	14,523		12,959	14,523	12,959
Accumulated Other Comprehensive Income (Loss)
Activity in accumulated other comprehensive loss
Balance	(28,329)	(25,199)	(30,511)	(25,199)	(32,883)
Changes before reclassifications	1,385		4,062	(1,293)	6,225
Amounts reclassified to net income	315		272	1,800	917
Tax effect	(225)		(332)	(525)	(768)
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	1,475		4,002	(1,655)	6,374
Balance	(26,854)		(26,509)	(26,854)	(26,509)
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01 - Investments
Activity in accumulated other comprehensive loss
Cumulative effect adjustment				(1,637)
Cumulative effect adjustment - unrealized gains on equity investments		(2,100)
Cumulative effect adjustment - tax expense		(500)
Translation Adjustment
Activity in accumulated other comprehensive loss
Balance	(24)	2,388	737	2,388	(927)
Changes before reclassifications	800		2,896	(1,612)	4,560
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	800		2,896	(1,612)	4,560
Balance	776		3,633	776	3,633
Change in Fair Value of Cash Flow Hedge
Activity in accumulated other comprehensive loss
Balance	(24)	154	(189)	154	74
Changes before reclassifications			495	(369)	256
Amounts reclassified to net income	93		22	225	(164)
Tax effect	(23)		(72)	36	90
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	70		445	(108)	182
Balance	46		256	46	256
Unrealized Gain (Loss) on Marketable Securities
Activity in accumulated other comprehensive loss
Balance	(197)	1,376	1,689	1,376	1,752
Changes before reclassifications	72		671	175	1,409
Amounts reclassified to net income	48		(585)	29	(1,425)
Tax effect	(30)		23	(50)	62
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	90		109	(1,483)	46
Balance	(107)		1,798	(107)	1,798
Unrealized Gain (Loss) on Marketable Securities | ASU 2016-01 - Investments
Activity in accumulated other comprehensive loss
Cumulative effect adjustment				(1,637)
Cumulative effect adjustment - unrealized gains on equity investments		(2,100)
Cumulative effect adjustment - tax expense		(500)
Net Pension Amortization and Net Actuarial Loss
Activity in accumulated other comprehensive loss
Balance	(28,084)	$ (29,117)	(32,748)	(29,117)	(33,782)
Amounts reclassified to net income	687		835	2,059	2,506
Tax effect	(172)		(283)	(511)	(920)
Other comprehensive income (loss) attributable to La-Z-Boy Incorporated	515		552	1,548	1,586
Balance	$ (27,569)		$ (32,196)	$ (27,569)	$ (32,196)