CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 108,699	$ 61,506	$ 261,500	$ 119,358
Contract costs	88,831	48,722	221,517	94,727
General and administrative costs	7,733	6,135	14,644	12,285
Depreciation and amortization	1,881	2,029	3,866	4,091
Total operating costs	98,445	56,886	240,027	111,103
Income from operations	10,254	4,620	21,473	8,255
Interest expense, net	554	1,004	1,226	2,084
Income before income taxes	9,700	3,616	20,247	6,171
Income tax expense	2,522	1,049	5,265	1,790
Net income	$ 7,178	$ 2,567	$ 14,982	$ 4,381
Net income per share - basic (in dollars per share)	$ 0.56	$ 0.20	$ 1.17	$ 0.35
Net income per share - diluted (in dollars per share)	$ 0.50	$ 0.19	$ 1.04	$ 0.32
Weighted average common stock outstanding
Basic (in shares)	12,778	12,544	12,763	12,521
Diluted (in shares)	14,442	13,570	14,368	13,568