CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 133	$ 19,396	$ 12,010
Non-cash items:
Depreciation and amortization	14,725	9,316	8,800
Amortization of debt issuance costs	483	0	0
Stock-based compensation expense	5,554	5,149	4,658
Provision for doubtful accounts	0	349	0
Deferred income taxes	(7,190)	(3,599)	2,512
Goodwill impairment	21,981	0	0
Other non-cash items	697	181	(1,034)
Changes in operating assets and liabilities:
Accounts receivable	17,327	(16,301)	(5,916)
Insurance recoverable - environmental remediation	(9,007)	1,135	(15,757)
Income taxes	(2,125)	3,795	864
Restricted investments	(427)	320	4,603
Prepaid expenses and other current assets	(2,895)	(142)	1,676
Long-term prepaid insurance	2,504	2,592	2,976
Other assets	5,098	(103)	667
Accounts payable	(4,955)	(1,019)	352
Accrued compensation and benefits	(5,949)	10,231	2,003
Deferred revenue	1,512	(5,710)	(3,707)
Environmental remediation liabilities	(97)	2,778	(858)
Other accrued liabilities	10,771	3,747	7,537
Net cash provided by operating activities	48,140	32,115	21,386
Cash flows from investing activities:
Additions to property and equipment	(8,328)	(6,606)	(5,065)
Withdrawals from restricted investments	1,131	1,030	2,241
Acquisition of businesses, net of cash acquired	(119,600)	(12,213)	(3,788)
Earnout and net working capital payments on acquisitions	0	0	(252)
Proceeds from sale of fixed assets	112	70	110
Investments in and advances to unconsolidated affiliates	0	0	(17)
Net cash used in investing activities	(126,685)	(17,719)	(6,771)
Cash flows from financing activities:
Payments on long-term debt and other	(13,220)	(5,595)	(9,535)
Payments on capital lease obligations	(166)	(563)	(628)
Proceeds from long-term debt and other	7,177	5,247	4,904
Proceeds from term loan	75,000	0	0
Repayments of term loan debt	(2,812)	0	0
Net working capital and additional cash payments on acquisitions	(1,161)	(2,644)	(872)
Shares repurchased to settle tax withholding obligations	(2,965)	(1,666)	(2,209)
Payments of issuance costs on revolving credit facility	(3,248)	0	0
Acquisition of non-controlling interest	(90)	0	0
Payments to noncontrolling interest	(40)	0	0
Excess tax benefit from stock-based awards	1,357	155	3,115
Proceeds from exercise of stock options	221	369	71
Net cash provided by (used) in financing activities	60,053	(4,697)	(5,154)
(Decrease) increase in cash and cash equivalents	(18,492)	9,699	9,461
Cash and cash equivalents, beginning of period	37,296	27,597	18,136
Cash and cash equivalents, end of period	18,804	37,296	27,597
Supplemental cash flow information:
Income taxes paid	10,128	10,994	2,205
Non-cash consideration for assets acquired	5,146	996	1,627
Issuance of common stock in connection with businesses acquired	0	323	295
Capital expenditures included in accounts payable	198	475	490
Interest paid	$ 2,707	$ 134	$ 192