Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 26,122	$ 8,986
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax benefit	(1,720)	(1,129)
Depreciation	5,130	3,928
Amortization	218	202
Stock-based compensation expense	551	270
Bad debt expense (recovery)	145	(336)
Inventory obsolescence expense	3,760	1,623
Gross profit from sale of used rental equipment	(9,265)
Excess tax benefit from share-based compensation	(2,034)	(238)
Loss on early extinguishment of debt		137
(Gain) loss on disposal of property, plant and equipment	(17)	184
Realized loss on short-term investments	1
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivable	1,296	(9,593)
Inventories	(29,085)	1,680
Other current assets	1,397	782
Accounts payable	7,172	2,545
Accrued expenses and other	6,033	1,855
Deferred revenue	(827)	4,988
Income tax payable	2,938	1,140
Net cash provided by operating activities	11,815	17,024
Cash flows from investing activities:
Proceeds from the sale of property, plant and equipment	1	11
Proceeds from sale of used rental equipment	16,691
Purchases of short-term investments	(1,940)
Capital expenditures	(16,789)	(652)
Net cash used in investing activities	(2,037)	(641)
Cash flows from financing activities:
Principal payments on mortgage loans	(7,700)	(1,738)
Penalty for early extinguishment of debt		(137)
Excess tax benefit from share-based compensation	2,034	238
Proceeds from exercise of stock options	1,687	601
Net cash used in financing activities	(3,979)	(1,036)
Effect of exchange rate changes on cash	(9)	(76)
Increase in cash and cash equivalents	5,790	15,271
Cash and cash equivalents, beginning of period	33,453	8,571
Cash and cash equivalents, end of period	$ 39,243	$ 23,842