Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
Current assets:
Cash and cash equivalents	$ 48,706	$ 31,388
Short-term investments	18,930	4,926
Trade accounts receivable, net	24,326	19,761
Current portion of notes receivable, net	1,588	2,100
Inventories, net	70,636	72,390
Deferred income tax assets	6,774	6,356
Other current assets	2,065	5,660
Total current assets	173,025	142,581
Rental equipment, net	24,689	11,945
Property, plant and equipment, net	34,426	34,692
Patents, net	139	319
Goodwill	1,843	1,843
Non-current deferred income tax assets	439	505
Non-current notes receivable, net	2,196	3,706
Prepaid income taxes	3,144	979
Other assets	203	231
Total assets	240,104	196,801
Current liabilities:
Accounts payable trade	5,602	5,042
Accrued expenses and other current liabilities	15,232	11,384
Deferred revenue	5,404	774
Deferred income tax liabilities	21	82
Income tax payable	2,862	399
Total current liabilities	29,121	17,681
Non-current deferred income tax liabilities	2,198	2,107
Total liabilities	31,319	19,788
Commitments and contingencies
Stockholders' equity:
Preferred stock
Common stock	64	64
Additional paid-in capital	59,130	57,446
Retained earnings	150,184	119,333
Accumulated other comprehensive income (loss)	(593)	170
Total stockholders' equity	208,785	177,013
Total liabilities and stockholders' equity	$ 240,104	$ 196,801