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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
	Oct. 25, 2014	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Concentration Risk [Line Items]
Gain on fire insurance recovery		$ 9,013	$ 0	$ 0	$ 9,752	$ 0	$ 0
Research and development costs					11,354	10,271	10,049
Advertising costs					26,968	26,061	$ 20,509
Money market securities, fair value					20,706	45,101
Deferred income taxes					0	$ 38,506
Tilda Milling Facility Fire
Concentration Risk [Line Items]
Gain on fire insurance recovery	$ 9,752	$ 9,013
Insurance settlements receivable					$ 4,234
Trade Receivables from One Customer
Concentration Risk [Line Items]
Concentration risk, percentage					10.00%	8.00%
Trade Receivables from Second Customer
Concentration Risk [Line Items]
Concentration risk, percentage					9.00%	7.00%
Sales to First Customer
Concentration Risk [Line Items]
Concentration risk, percentage					10.00%	11.00%	13.00%
Sales to Second Customer
Concentration Risk [Line Items]
Concentration risk, percentage					10.00%	10.00%	11.00%