Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Cash flows provided by (used in) operating activities:
Net income	$ 25,989	$ 24,344	$ 28,320
Adjustment to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in fair value of derivative instruments	(8,549)	2,567	(5,622)
Depreciation and amortization	18,029	20,324	18,425
Loss on redemption of debt		1,700	1,132
Provision for losses on accounts receivable	6,017	10,388	5,279
Change in deferred taxes	12,913	15,831	13,331
Changes in operating assets and liabilities net of amounts related to acquisitions:
(Increase) decrease in receivables	5,804	(31,593)	(4,570)
(Increase) decrease in inventories	34,335	(13,189)	(2,012)
Decrease in other assets	4,226	1,594	13,912
Increase (decrease) in accounts payable	3,372	1,943	(1,784)
Increase (decrease) in customer credit balances	11,952	(1,776)	(9,250)
Increase (decrease) in other current and long-term liabilities	(8,260)	7,269	(12,732)
Net cash provided by operating activities	105,828	39,402	44,429
Cash flows provided by (used in) investing activities:
Capital expenditures	(5,803)	(6,361)	(5,567)
Proceeds from sales of fixed assets	503	92	392
Acquisitions (net of cash acquired of $0, $0, and $3,390, respectively)	(39,217)	(9,659)	(68,658)
Earnout			(123)
Net cash used in investing activities	(44,517)	(15,928)	(73,956)
Cash flows provided by (used in) financing activities:
Revolving credit facility borrowings	86,252	88,416	36,754
Revolving credit facility repayments	(86,252)	(88,416)	(36,754)
Repayment of debt		(82,499)	(50,854)
Proceeds from the issuance of debt		124,188
Debt extinguishment costs		(1,409)
Distributions	(19,525)	(20,677)	(20,353)
Unit repurchase	(19,648)	(10,949)	(33,234)
Increase in deferred charges	(836)	(6,401)	(130)
Net cash provided by (used in) financing activities	(40,009)	2,253	(104,571)
Net increase (decrease) in cash	21,302	25,727	(134,098)
Cash and equivalent at beginning of period	86,789	61,062	195,160
Cash and equivalent at end of period	$ 108,091	$ 86,789	$ 61,062