CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 38,744	$ 55,873
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Deferred income tax benefit	(730)	(83)
Depreciation and amortization	13,125	9,390
Accretion of discounts on short-term-investments	3	162
Stock-based compensation	3,026	434
Bad debt expense (recovery)	658	554
Inventory obsolescence expense (recovery)	2,176	(77)
Gross profit from the sale of used rental equipment	(10,309)	(12,180)
(Gain) loss on disposal of property, plant and equipment	(60)	14
Realized gain on short-term investments		(19)
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivable	25,081	(19,389)
Inventories	(6,738)	(58,404)
Costs and estimated earnings in excess of billings	12,400	(28,387)
Other current assets	78	2,004
Prepaid income taxes	(109)	(1,216)
Accounts payable	(12,036)	3,384
Accrued expenses and other	(255)	3,270
Deferred revenue	2,987	(7,914)
Income taxes payable	3,033	1,182
Net cash provided by (used in) operating activities	71,074	(51,402)
Cash flows from investing activities:
Purchase of property, plant and equipment	(5,650)	(17,034)
Investment in rental equipment	(25,726)	(19,579)
Proceeds from sale of used rental equipment	16,019	23,798
Proceeds from sale of property, plant and equipment	27
Purchases of short-term investments	(5,867)	(1,587)
Proceeds from the sale of short-term investments		21,139
Net cash provided by (used in) investing activities	(21,197)	6,737
Cash flows from financing activities:
Principal payments on debt arrangements	(931)
Excess tax benefit from stock-based compensation	674	2,948
Proceeds from exercise of stock options	265	917
Net cash provided by financing activities	8	3,865
Effect of exchange rate changes on cash	(3)	5
Increase (decrease) in cash and cash equivalents	49,882	(40,795)
Cash and cash equivalents, beginning of period	2,726	50,752
Cash and cash equivalents, end of period	$ 52,608	$ 9,957