Goodwill and Intangible Assets - Components of Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Sep. 29, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 10,007	$ 53,276
Accumulated amortization		(8,465)	(10,118)
Amortizable intangibles, net		$ 1,542	43,158
Weighted average amortization period, in years	9 years 6 months	5 years 4 months 24 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 5,739	40,118
Accumulated amortization		(5,610)	(6,749)
Amortizable intangibles, net		$ 129	33,369
Weighted average amortization period, in years	9 years 8 months 12 days	4 years 3 months 18 days
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 4,268	13,158
Accumulated amortization		(2,855)	(3,369)
Amortizable intangibles, net		$ 1,413	$ 9,789
Weighted average amortization period, in years	9 years 1 month 6 days	5 years 6 months