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Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 358,887	$ 245,645	$ 1,017,966	$ 798,466
Cost of revenues	321,981	230,754	929,753	727,981
Gross profit	36,906	14,891	88,213	70,485
Selling, general and administrative expenses	24,112	20,753	67,672	63,852
Operating income (loss)	12,794	(5,862)	20,541	6,633
Other income (expense):
Interest expense	(301)	(643)	(954)	(2,080)
Interest income	307	130	863	234
Other	58	370	582	384
Income (loss) before income tax expense	12,858	(6,005)	21,032	5,171
Provision (benefit) for federal, state and foreign income taxes	3,925	(852)	5,862	1,968
Net income (loss)	$ 8,933	$ (5,153)	$ 15,170	$ 3,203
Basic earnings per common share (US$ per share)	$ 0.33	$ (0.19)	$ 0.56	$ 0.12
Diluted earnings per common share (US$ per share)	$ 0.33	$ (0.19)	$ 0.55	$ 0.12
Weighted average common shares outstanding:
Basic (shares)	26,788	26,817	26,918	26,747
Diluted (shares)	27,417	26,817	27,587	27,054

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