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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Cash flows provided by (used in) operating activities:      
Net income $ 44,934 $ 37,556 $ 36,084
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
(Increase) decrease in fair value of derivative instruments (18,217) 4,187 6,566
Depreciation and amortization 27,777 26,748 23,237
Multiemployer pension plan withdrawal charge   17,796  
Loss on redemption of debt   7,345  
(Recovery) provision for losses on accounts receivable (639) 3,738 7,514
Change in deferred taxes 9,670 (4,101) 658
Changes in operating assets and liabilities net of amounts related to acquisitions:      
Decrease in receivables 10,965 30,141 12,771
Decrease in inventories 9,979 4,326 14,057
(Increase) decrease in other assets (2,354) 113 2,571
Increase (decrease) in accounts payable (705) 3,189 (8,091)
Increase (decrease) in customer credit balances 6,490 3,992 (2,433)
Increase in other current and long-term liabilities 14,057 1,823 2,221
Net cash provided by operating activities 101,957 136,853 95,155
Cash flows provided by (used in) investing activities:      
Capital expenditures (10,134) (9,555) (9,112)
Proceeds from sales of fixed assets 318 300 257
Acquisitions (net of cash acquired of $0, $0, and $4,151, respectively) (9,815) (21,130) (98,463)
Net cash used in investing activities (19,631) (30,385) (107,318)
Cash flows provided by (used in) financing activities:      
Revolving credit facility borrowings   12,296 195,482
Revolving credit facility repayments   (12,296) (195,482)
Redemption of senior notes   (125,000)  
Debt redemption cost   (5,548)  
Proceeds from term loan   100,000  
Loan repayments (7,500)    
Distributions (23,092) (21,298) (19,850)
Unit repurchases (12,017) (691) (1,663)
Customer retainage payments (740)    
Payments of debt issue costs (297) (2,422) (2,382)
Net cash used in financing activities (43,646) (54,959) (23,895)
Net increase (decrease) in cash 38,680 51,509 (36,058)
Cash and cash equivalents at beginning of period 100,508 48,999 85,057
Cash and cash equivalents at end of period $ 139,188 $ 100,508 $ 48,999