Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Jun. 30, 2017 USD ($) warehouse route shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares
Property, Plant and Equipment
number of delivery routes | route	450
Derivative instruments designated as cash flow hedges (percent)	94.00%	96.00%
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)	$ (7,000)
Provision for (recovery of) doubtful accounts	325,000	$ 71,000	$ (8,000)
Cost of goods sold	327,765,000	335,907,000	$ 348,846,000
Property, plant and equipment gross	$ 352,010,000	$ 314,709,000
Shares issuable under stock options (in shares) | shares	117,007	124,879	139,524
Antidilutive securities excluded from computation of earnings per share (in shares) | shares	24,671	30,931	10,455
Impairment losses on goodwill and intangible assets	$ 0	$ 0
Shipping and handling costs	23,500,000	13,300,000	$ 8,300,000
Undiscounted workers' compensation liability	9,400,000	14,700,000
Reinsurance recoveries	1,500,000	2,400,000
Liability for Claims and Claims Adjustment Expense	$ 900,000	900,000
Allowance for Doubtful Accounts Receivable, Recoveries			8,000
Security Deposit - Letter of Credit
Property, Plant and Equipment
Letter of credit posted as security deposit		7,400,000
Workforce Subject to Collective Bargaining Arrangements
Property, Plant and Equipment
Concentration risk (percent)	27.00%
Deposits Held At CommodityTrading Accounts
Property, Plant and Equipment
Restricted cash	$ 0
Health Insurance Product Line
Property, Plant and Equipment
Self Insurance Reserve	2,500,000	1,300,000
Coffee Brewing Equipment and Service
Property, Plant and Equipment
Cost of goods sold	$ 26,300,000	27,000,000	26,600,000
Maximum
Property, Plant and Equipment
Cash equivalents and short-term investments maturity period	180 days
Branch Warehouses
Property, Plant and Equipment
Number of real estate properties | warehouse	114
Building and Facilities
Property, Plant and Equipment
Property, plant and equipment gross	$ 108,682,000	82,878,000
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
Property, Plant and Equipment
Property, plant and equipment gross	$ 201,236,000	182,227,000
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
Property, Plant and Equipment
Property, plant and equipment gross	$ 12,758,000	16,077,000
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
Property, Plant and Equipment
Property, plant and equipment gross	$ 21,794,000	21,545,000
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
Coffee Brewing Equipment
Property, Plant and Equipment
Depreciation	$ 9,100,000	9,800,000	$ 10,400,000
Property, plant and equipment gross	$ 10,800,000	$ 8,400,000