CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Current assets:
Cash and cash equivalents	$ 12,308	$ 50,752
Short-term investments	10,635	19,960
Trade accounts receivable, net	34,110	16,229
Current portion of notes receivable, net	7,426	3,806
Inventories, net	111,473	83,894
Costs and estimated earnings in excess of billings	11,309
Deferred income tax assets	6,207	6,689
Prepaid expenses and other current assets	10,645	5,898
Total current assets	204,113	187,228
Rental equipment, net	38,072	27,853
Property, plant and equipment, net	40,443	34,433
Goodwill	1,843	1,843
Non-current deferred income tax assets	115	307
Non-current notes receivable, net	820	1,687
Prepaid income taxes	7,513	5,479
Other assets	103	192
Total assets	293,022	259,022
Current liabilities:
Accounts payable trade	18,923	17,187
Accrued expenses and other current liabilities	11,623	13,978
Deferred revenue	185	8,641
Deferred income tax liabilities		111
Income taxes payable	687	1,275
Total current liabilities	31,418	41,192
Non-current deferred income tax liabilities	3,411	2,843
Total liabilities	34,829	44,035
Commitments and contingencies
Stockholders' equity:
Preferred stock
Common stock	129	128
Additional paid-in capital	64,817	60,633
Retained earnings	193,333	154,451
Accumulated other comprehensive loss	(86)	(225)
Total stockholders' equity	258,193	214,987
Total liabilities and stockholders' equity	$ 293,022	$ 259,022