Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 17,019	$ 6,527
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for accounts receivable allowances	13,940	10,834
Depreciation and amortization	56,146	54,985
Amortization original issue discount and financing costs	1,407	1,379
Stock-based compensation	6,596	15,200
Deferred income taxes	(8,205)	2,476
Loss on disposal of assets	327	722
Gain from company owned life insurance policy	(501)	0
Change in fair value of contingent consideration	194	(556)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(17,327)	(27,356)
Other assets	8,280	(7,393)
Accounts payable	(1,896)	3,881
Accrued payroll and related costs	(5,202)	(4,156)
Other accrued liabilities	2,424	7,462
Other long-term liabilities	(3,182)	(3,364)
Net cash provided by operating activities	70,020	60,641
Investing activities:
Acquisition of businesses, net of cash acquired	(42,432)	(44,481)
Purchases of property and equipment	(32,981)	(31,655)
Deposit on acquisition	(9,451)	0
Change in restricted cash	751	(121)
Proceeds from company owned life insurance policy	738	0
Proceeds from sale of assets	1,164	1,219
Net cash used in investing activities	(82,211)	(75,038)
Financing activities:
Repayments of long-term debt	(4,916)	(4,916)
Proceeds from borrowings under senior revolver	4,100	45,900
Repayments of borrowings under senior revolver	(4,100)	(45,900)
Repayments of capital lease obligations	(407)	(371)
Cash paid for earn-out obligations	(6,109)	(3,565)
Payments of deferred financing costs	(878)	0
Issuance of common stock under employee equity incentive plans	357	142
Tax windfall from stock-based compensation	0	745
Taxes paid related to net share settlements of equity awards	(436)	(82)
Net cash used in financing activities	(12,389)	(8,047)
Net decrease in cash and cash equivalents	(24,580)	(22,444)
Cash and cash equivalents at beginning of period	50,683	41,690
Cash and cash equivalents at end of period	26,103	19,246
Supplemental disclosure of cash flow information
Cash paid for interest	23,261	23,664
Cash paid for income taxes	13,493	11,993
Supplemental disclosure of non-cash activities:
Accrued property and equipment	946	1,166
Tenant reimbursements for leasehold improvements	$ 0	$ 2,130