Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended								12 Months Ended
	Jun. 30, 2018 USD ($) warehouse route	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2018 USD ($) warehouse route	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jul. 01, 2017 USD ($)
Property, Plant and Equipment
number of delivery routes | route	447								447
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)									$ 226,000	$ (7,000)
Cost of goods sold	$ 96,939,000	$ 105,716,000	$ 111,175,000	$ 85,672,000	$ 91,025,000	$ 88,305,000	$ 89,531,000	$ 85,761,000	399,502,000	354,622,000	$ 373,214,000
Shipping and handling costs									11,900,000	10,700,000	11,100,000
Undiscounted workers' compensation liability	7,100,000				9,400,000				7,100,000	9,400,000
Reinsurance recoveries	900,000				1,500,000				900,000	1,500,000
Liability for Claims and Claims Adjustment Expense	1,700,000				900,000				1,700,000	900,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	1,600,000				1,600,000				1,600,000	1,600,000
Adjustments to allowance for doubtful accounts									(909,000)	(325,000)	(71,000)
Cash [Member]
Property, Plant and Equipment
Letter of credit posted as security deposit									2,300,000
Security Deposit - Letter of Credit
Property, Plant and Equipment
Letter of credit posted as security deposit									$ 2,000,000
Workforce Subject to Collective Bargaining Arrangements
Property, Plant and Equipment
Concentration risk (percent)									27.00%
Health Insurance Product Line
Property, Plant and Equipment
Self Insurance Reserve	$ 1,600,000				$ 2,500,000				$ 1,600,000	2,500,000
Coffee Brewing Equipment and Service
Property, Plant and Equipment
Cost of goods sold									$ 30,200,000	26,300,000	$ 27,000,000
Branch Warehouses
Property, Plant and Equipment
Number of real estate properties | warehouse	111								111
Building and Facilities | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life									30 years
Building and Facilities | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life									10 years
Machinery and Equipment | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life									10 years
Machinery and Equipment | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life									3 years
Office Furniture and Equipment | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life									7 years
Office Furniture and Equipment | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life									5 years
Capitalized Software Costs | Maximum
Property, Plant and Equipment
Property, plant and equipment useful life									5 years
Capitalized Software Costs | Minimum
Property, Plant and Equipment
Property, plant and equipment useful life									3 years
Deposits [Member]
Property, Plant and Equipment
Letter of credit posted as security deposit										$ 3,400,000
Accounting Standards Update 2017-12 [Member]
Property, Plant and Equipment
Adjustment due to the adoption of ASU												$ 133,000
Accounting Standards Update 2017-12 [Member] | Retained Earnings
Property, Plant and Equipment
Adjustment due to the adoption of ASU				$ 300,000								$ 342,000