Segment Information - Schedule of Financial Information by Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 355,436	$ 259,963	$ 677,697	$ 504,065
Operating (loss) income	(69,069)	13,564	(58,997)	22,797
Depreciation	2,845	2,018	5,275	3,860
Amortization	(1,202)	(112)	(1,683)	(238)
Assets	665,412		665,412		$ 395,398
Operating Segments [Member] | U.S Factory-built Housing [Member]
Segment Reporting Information [Line Items]
Net sales	306,615	205,963	572,739	399,139
Operating (loss) income	26,687	14,817	49,603	25,804
Depreciation	2,415	1,651	4,460	3,153
Amortization	1,142	49	1,562	117
Capital expenditures	2,176	1,464	3,456	5,020
Assets	471,833		471,833		190,323
Operating Segments [Member] | Canadian Factory-built Housing [Member]
Segment Reporting Information [Line Items]
Net sales	25,401	26,653	52,755	49,056
Operating (loss) income	3,035	3,781	6,555	6,639
Depreciation	227	235	458	444
Amortization	60	63	121	121
Capital expenditures	204	57	414	400
Assets	56,484		56,484		54,449
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Net sales	23,420	27,347	52,203	55,870
Operating (loss) income	(94,744)	(2,904)	(108,197)	(5,548)
Depreciation	203	132	357	263
Capital expenditures	285	375	814	433
Assets	137,095		137,095		150,626
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Net sales	355,436	259,963	677,697	504,065
Depreciation	2,845	2,018	5,275	3,860
Amortization	1,202	112	1,683	238
Capital expenditures	2,665	$ 1,896	4,684	$ 5,853
Assets	$ 665,412		$ 665,412		$ 395,398