Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Cash flows provided by (used in) operating activities:
Net income	$ 37,556	$ 36,084	$ 29,906
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in the fair value of derivative instruments	4,187	6,566	6,775
Depreciation and amortization	26,748	23,237	19,047
Multiemployer pension plan withdrawal charge	17,796
Loss on redemption of debt	7,345
Provision for losses on accounts receivable	3,738	7,514	6,481
Change in deferred taxes	(4,101)	658	1,676
Changes in operating assets and liabilities net of amounts related to acquisitions:
(Increase) decrease in receivables	30,141	12,771	(14,074)
(Increase) decrease in inventories	4,326	14,057	(20,664)
Decrease in other assets	113	2,571	4,207
Increase (decrease) in accounts payable	3,189	(8,091)	(4,555)
Increase (decrease) in customer credit balances	3,992	(2,433)	(15,878)
Increase in other current and long-term liabilities	1,823	2,221	5,571
Net cash provided by operating activities	136,853	95,155	18,492
Cash flows provided by (used in) investing activities:
Capital expenditures	(9,555)	(9,112)	(5,994)
Proceeds from sales of fixed assets	300	257	410
Acquisitions (net of cash acquired of $0, $4,151, and $0, respectively)	(21,130)	(98,463)	(1,376)
Net cash used in investing activities	(30,385)	(107,318)	(6,960)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings	12,296	195,482	111,542
Revolving credit facility repayments	(12,296)	(195,482)	(111,542)
Redemption of senior notes	(125,000)
Debt redemption cost	(5,548)
Proceeds from term loan	100,000
Distributions	(21,298)	(19,850)	(19,313)
Unit repurchases	(691)	(1,663)	(15,217)
Payments of debt issue costs	(2,422)	(2,382)	(36)
Net cash used in financing activities	(54,959)	(23,895)	(34,566)
Net increase (decrease) in cash	51,509	(36,058)	(23,034)
Cash and equivalents at beginning of period	48,999	85,057	108,091
Cash and equivalents at end of period	$ 100,508	$ 48,999	$ 85,057