Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Cash flows from operating activities:
Net income	$ 29,711	$ 14,082	$ 1,760
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	(718)	(1,416)	451
Depreciation	6,769	4,921	4,943
Amortization	278	263	246
Stock-based compensation	736	445	283
Bad debt expense (recovery)	128	(479)	318
Inventory obsolescence expense	4,608	2,872	1,272
Gross profit from sale of used rental equipment	(11,165)	(385)	(277)
Loss on early extinguishment of debt		137
(Gain) loss on disposal of property, plant and equipment		184	12
Realized loss on short-term investments	27
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivable	2,006	(2,678)	14,257
Inventories	(29,528)	6,673	3,238
Other current assets	(2,539)	(855)	223
Accounts payable	1,227	(879)	(3,382)
Accrued expenses and other	1,810	3,047	(4,348)
Deferred revenue	(558)	948	(550)
Income tax payable	(1,656)	1,898	(1,382)
Net cash provided by operating activities	1,136	28,778	17,064
Cash flows from investing activities:
Proceeds from the sale of property, plant and equipment	1	11	23
Proceeds from the sale of used rental equipment	19,917	1,243	277
Purchases of short-term investments	(4,926)
Investment in rental equipment	(15,414)	(3,893)	(1,319)
Purchase of property and equipment	(4,730)	(2,224)	(390)
Net cash used in investing activities	(5,152)	(4,863)	(1,409)
Cash flows from financing activities:
Change in book overdrafts			(35)
Net borrowings (principal payments) under line of credit			(9,978)
Principal payments under mortgage loans	(7,700)	(1,848)	(709)
Penalty for early extinguishment of debt		(137)
Excess tax benefits from stock-based compensation	6,896	1,128	147
Proceeds from exercise of stock options and other	2,758	2,187	841
Net cash provided by (used in) financing activities	1,954	1,330	(9,734)
Effect of exchange rate changes on cash	(3)	(363)	1,088
Increase (decrease) in cash and cash equivalents	(2,065)	24,882	7,009
Cash and cash equivalents, beginning of fiscal year	33,453	8,571	1,562
Cash and cash equivalents, end of fiscal year	$ 31,388	$ 33,453	$ 8,571