CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 55,873	$ 30,851
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	(83)	69
Depreciation and amortization	9,390	7,351
Accretion of discounts on short-term-investments	162	119
Stock-based compensation	434	555
Bad debt expense	554	325
Inventory obsolescence (recovery) provision	(77)	1,395
Gross profit from the sale of used rental equipment	(12,180)	(8,174)
Loss on disposal of property, plant and equipment	14	3
Realized (gain) loss on short-term investments	(19)	1
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivable	(19,389)	(2,873)
Inventories	(58,404)	(1,261)
Costs and estimated earnings in excess of billings	(28,387)
Prepaid expenses and other current assets	2,004	3,540
Prepaid income taxes	(1,216)	(2,165)
Accounts payable trade	3,384	567
Accrued expenses and other	3,270	2,572
Deferred revenue	(7,914)	4,683
Income taxes payable	1,182	2,461
Net cash provided by (used in) operating activities	(51,402)	40,019
Cash flows from investing activities:
Purchase of property, plant and equipment	(17,034)	(3,049)
Proceeds from the sale of property, plant and equipment		14
Investment in rental equipment	(19,579)	(24,593)
Proceeds from sale of used rental equipment	23,798	17,560
Purchases of short-term investments	(1,587)	(15,336)
Proceeds from the sale of short-term investments	21,139	1,580
Net cash provided by (used in) investing activities	6,737	(23,824)
Cash flows from financing activities:
Excess tax benefit from stock-based compensation	2,948	493
Proceeds from exercise of stock options and other	917	636
Net cash provided by financing activities	3,865	1,129
Effect of exchange rate changes on cash	5	(6)
Increase (decrease) in cash and cash equivalents	(40,795)	17,318
Cash and cash equivalents, beginning of period	50,752	31,388
Cash and cash equivalents, end of period	$ 9,957	$ 48,706