CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 131,668	$ 16,058	$ 7,137
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	53,973	55,134	52,317
Interest expense related to amortization of debt issue costs and debt discount	6,180	2,175	5,841
Stock-based compensation	2,826	2,165	1,703
Deferred income taxes	(96,742)	1,666	698
Tax benefit from exercise of stock appreciation rights and vesting of restricted stock	(1,543)	0	0
Net loss (gain) on disposition of property, plant and equipment	49	95	(649)
Loss (gain) on sale of discontinued operations, net of income taxes	229	(2,727)	55
Asset impairments	0	1,815	0
Net loss of unconsolidated joint ventures	262	529	0
Decrease (increase) in trade receivables	(14,194)	517	(5,035)
Decrease (increase) in inventories	(1,007)	(2,347)	2,221
Decrease in accounts payable and accrued liabilities	(11,557)	(13,225)	(4,218)
Other changes in operating assets and liabilities, net	(6,756)	(1,478)	(1,507)
Net cash provided by operating activities	63,388	60,377	58,563
Cash flows from investing activities:
Business acquisitions	(5,650)	(95,604)	(43,250)
Investments in unconsolidated joint ventures	(125)	(1,875)	0
Purchase of property, plant and equipment	(36,859)	(35,799)	(29,119)
Proceeds from disposition of property, plant and equipment	915	905	791
Proceeds from sale of discontinued operations	0	4,666	4,813
Net decrease (increase) in long-term receivables and deposits	3,450	7,445	(1,171)
Net change in other assets	(597)	(1,556)	(437)
Net cash used in investing activities	(38,866)	(121,818)	(68,373)
Cash flows from financing activities:
Net proceeds from issuance of common stock	0	0	77,957
Net proceeds from issuance of long-term debt	414,675	146,650	0
Payments on long-term debt	(449,799)	(7,792)	(47,355)
Dividends paid to non-controlling interest in consolidated subsidiary	(1,690)	(950)	0
Employee stock purchases	804	759	742
Tax benefit from exercise of stock appreciation rights and vesting of restricted stock	1,543	0	0
Net cash provided by (used in) financing activities	(34,467)	138,667	31,344
Net increase (decrease) in cash and cash equivalents	(9,945)	77,226	21,534
Cash and cash equivalents, beginning of period	152,542	75,316	53,782
Cash and cash equivalents, end of period	142,597	152,542	75,316
Supplemental schedule of non-cash investing and financing activities:
Increase in accrued liabilities for acquisition-related commitment	0	2,614	0
Purchase of assets in exchange for future obligations	4,203	2,875	0
Supplemental disclosure of cash flow information:
Cash paid for interest	58,681	42,572	37,290
Cash paid for income taxes	$ 3,295	$ 1,729	$ 2,537