Changes in Accounting Principles and Corrections to Previously Issued Financial Statements - Schedules of Accounting Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Income Statement Related Disclosures [Abstract]
Cost of goods sold	$ 99,205	$ 85,630
Gross profit	48,235	46,083
Selling expenses	37,310	32,856
General and administrative expenses	8,617	11,359
Operating Expenses	50,313	44,238
Income (loss) from operations	(2,078)	1,845
Interest Expense	(2,852)	(2,168)
Other, net	657	1,750
Nonoperating Income (Expense)	(2,195)	(412)
Income (loss) before taxes	(4,273)	1,433
Income tax (benefit) expense	(1,287)	592
Net (loss) income	(2,986)	841
Net (loss) income available to common stockholders	$ (3,118)	$ 841
Net income available to common stockholders per common share—basic (in US$ per share)	$ (0.18)	$ 0.05
Net income available to common stockholders per common share—diluted (in US$ per share)	$ (0.18)	$ 0.05
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income taxes	$ (1,334)	$ 407
Net losses (gains) on derivative instruments and investments	3,068	(968)
Change in operating assets and liabilities:
Inventories	(11,062)	(10,393)
Derivative assets (liabilities), net	(5,198)	(493)
Net cash provided by operating activities	$ 1,080	7,104
As Previously Reported
Income Statement Related Disclosures [Abstract]
Cost of goods sold		82,706
Gross profit		49,007
Selling expenses		38,915
General and administrative expenses		11,327
Operating Expenses		50,265
Income (loss) from operations		(1,258)
Interest Expense		(523)
Other, net		87
Nonoperating Income (Expense)		(430)
Income (loss) before taxes		(1,688)
Income tax (benefit) expense		(710)
Net (loss) income		(978)
Net (loss) income available to common stockholders		$ (978)
Net income available to common stockholders per common share—basic (in US$ per share)		$ (0.06)
Net income available to common stockholders per common share—diluted (in US$ per share)		$ (0.06)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income taxes		$ (895)
Net losses (gains) on derivative instruments and investments		261
Change in operating assets and liabilities:
Inventories		(8,539)
Derivative assets (liabilities), net		(455)
Net cash provided by operating activities		7,104
Restatement Adjustment
Income Statement Related Disclosures [Abstract]
Cost of goods sold		(42)
Gross profit		42
Selling expenses		28
General and administrative expenses		32
Operating Expenses		60
Income (loss) from operations		(18)
Interest Expense		(1,645)
Other, net		1,663
Nonoperating Income (Expense)		18
Income (loss) before taxes		0
Income tax (benefit) expense		0
Net (loss) income		0
Net (loss) income available to common stockholders		$ 0
Net income available to common stockholders per common share—basic (in US$ per share)		$ 0.00
Net income available to common stockholders per common share—diluted (in US$ per share)		$ 0.00
Restatement Adjustment | LIFO to FIFO Adjustment
Income Statement Related Disclosures [Abstract]
Cost of goods sold		$ (445)
Gross profit		445
Selling expenses		0
General and administrative expenses		0
Operating Expenses		0
Income (loss) from operations		445
Interest Expense		0
Other, net		0
Nonoperating Income (Expense)		0
Income (loss) before taxes		445
Income tax (benefit) expense		608
Net (loss) income		(163)
Net (loss) income available to common stockholders		$ (163)
Net income available to common stockholders per common share—basic (in US$ per share)		$ (0.01)
Net income available to common stockholders per common share—diluted (in US$ per share)		$ (0.01)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income taxes		$ 608
Net losses (gains) on derivative instruments and investments		(1,229)
Change in operating assets and liabilities:
Inventories		821
Derivative assets (liabilities), net		(38)
Net cash provided by operating activities		(1)
Restatement Adjustment | Preferable Freight and Warehousing Adjustments
Income Statement Related Disclosures [Abstract]
Cost of goods sold		4,462
Gross profit		(4,462)
Selling expenses		(5,045)
General and administrative expenses		0
Operating Expenses		(5,045)
Income (loss) from operations		583
Interest Expense		0
Other, net		0
Nonoperating Income (Expense)		0
Income (loss) before taxes		583
Income tax (benefit) expense		151
Net (loss) income		432
Net (loss) income available to common stockholders		$ 432
Net income available to common stockholders per common share—basic (in US$ per share)		$ 0.03
Net income available to common stockholders per common share—diluted (in US$ per share)		$ 0.03
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income taxes		$ 151
Net losses (gains) on derivative instruments and investments		0
Change in operating assets and liabilities:
Inventories		(582)
Derivative assets (liabilities), net		0
Net cash provided by operating activities		1
Restatement Adjustment | Corrections of Freight, Overhead Variances and PPVs
Income Statement Related Disclosures [Abstract]
Cost of goods sold		(1,051)
Gross profit		1,051
Selling expenses		(1,042)
General and administrative expenses		0
Operating Expenses		(1,042)
Income (loss) from operations		2,093
Interest Expense		0
Other, net		0
Nonoperating Income (Expense)		0
Income (loss) before taxes		2,093
Income tax (benefit) expense		543
Net (loss) income		1,550
Net (loss) income available to common stockholders		$ 1,550
Net income available to common stockholders per common share—basic (in US$ per share)		$ 0.09
Net income available to common stockholders per common share—diluted (in US$ per share)		$ 0.09
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income taxes		$ 543
Net losses (gains) on derivative instruments and investments		0
Change in operating assets and liabilities:
Inventories		(2,093)
Derivative assets (liabilities), net		0
Net cash provided by operating activities		$ 0