Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
ASSETS
Cash and cash equivalents	$ 44,150	$ 31,388
Short-term investments	4,968	4,926
Trade accounts receivable, net	34,264	19,761
Current portion of notes receivable, net	1,594	2,100
Inventories, net	69,210	72,390
Deferred income tax assets	6,572	6,356
Other current assets	2,437	5,660
Total current assets	163,195	142,581
Rental equipment, net	26,466	11,945
Property, plant and equipment, net	34,508	34,692
Patents, net	199	319
Goodwill	1,843	1,843
Non-current deferred income tax assets	284	505
Non-current notes receivable, net	2,698	3,706
Prepaid income taxes	3,709	979
Other assets	211	231
Total assets	233,113	196,801
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable trade	11,816	5,042
Accrued expenses and other current liabilities	11,581	11,384
Deferred revenue	5,447	774
Deferred income tax liabilities		82
Income tax payable	3,093	399
Total current liabilities	31,937	17,681
Non-current deferred income tax liability	2,423	2,107
Total liabilities	34,360	19,788
Commitments and contingencies
Stockholders' equity:
Preferred stock
Common stock	64	64
Additional paid-in capital	58,852	57,446
Retained earnings	139,449	119,333
Accumulated other comprehensive income	388	170
Total stockholders' equity	198,753	177,013
Total liabilities and stockholders' equity	$ 233,113	$ 196,801