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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 248,327	$ 358,887	$ 905,101	$ 1,017,966
Cost of revenue	227,850	321,981	822,158	929,753
Gross profit	20,477	36,906	82,943	88,213
Selling, general and administrative expenses	19,718	24,112	66,574	67,672
Goodwill and other intangible asset impairment	0	0	38,515	0
Restructuring costs	6,559	0	6,559	0
Operating income (loss)	(5,800)	12,794	(28,705)	20,541
Other income (expense):
Interest expense	(398)	(301)	(1,231)	(954)
Interest income	356	307	1,247	863
Other	(767)	58	(368)	582
Income (loss) before income tax expense	(6,609)	12,858	(29,057)	21,032
Provision (benefit) for federal, state and foreign income taxes	(1,114)	3,925	(1,705)	5,862
Net income (loss)	$ (5,495)	$ 8,933	$ (27,352)	$ 15,170
Basic earnings (loss) per common share (US$ per share)	$ (0.21)	$ 0.33	$ (1.02)	$ 0.56
Diluted earnings (loss) per common share (US$ per share)	$ (0.21)	$ 0.33	$ (1.02)	$ 0.55
Weighted average common shares outstanding:
Basic (shares)	26,478	26,788	26,781	26,918
Diluted (shares)	26,478	27,417	26,781	27,587

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration