Acquisitions - Retail Segment (Details) $ in Thousands			2 Months Ended
	Sep. 30, 2018 USD ($) store Counterparty	Aug. 15, 2018 store Counterparty warehouse	Sep. 30, 2018 USD ($) store Counterparty	Oct. 27, 2018 USD ($)	Apr. 28, 2018 USD ($)
Amounts recognized for identifiable assets acquired and liabilities assumed:
Goodwill				$ 182,116	$ 75,254
Independent dealer assets acquired in fiscal 2019
Acquisitions
Number of dealers whose assets were acquired | Counterparty			2
Period of guaranteed future payments			34 months
Fair value of consideration:
Cash			$ 38,904
Forgiveness of accounts receivable			2,610
Guaranteed future payments			1,300
Total fair value of consideration			42,814
Amounts recognized for identifiable assets acquired and liabilities assumed:
Inventory	$ 10,491		10,491
Other current assets	4,194		4,194
Property, plant and equipment	929		929
Indefinite-lived reacquired rights	6,600		6,600
Other long-term assets	183		183
Customer deposits	(6,515)		(6,515)
Other current liabilities	(5,055)		(5,055)
Total identifiable net assets (liabilities) acquired	10,827		10,827
Goodwill	$ 31,987		$ 31,987
Independent dealer assets acquired in fiscal 2019 | Arizona
Acquisitions
Number of dealers whose assets were acquired | Counterparty		1
Number of stores included in acquisition | store		9
Number of warehouses included in acquisition | warehouse		2
Independent dealer assets acquired in fiscal 2019 | Massachusetts
Acquisitions
Number of dealers whose assets were acquired | Counterparty	1
Number of stores included in acquisition | store	1		1