Business Combination - Summary of Results of Operation as Reported and Proforma Basis (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Net sale, Reported	$ 355,436,000	$ 259,963,000	$ 677,697,000	$ 504,065,000
Net income (loss), Proforma	$ 0
Skyline [Member]
Business Acquisition [Line Items]
Net sale, Reported		259,963,000	677,697,000	504,065,000
Net income (loss), Reported		7,408,000	(77,878,000)	12,671,000
Net sale, Proforma		318,425,000	723,501,000	621,990,000
Net income (loss), Proforma		$ 8,058,000	$ (62,769,000)	$ 14,247,000