CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ (5,445)us-gaap_NetIncomeLoss	$ 24,176us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred income tax expense (benefit)	(702)us-gaap_DeferredIncomeTaxExpenseBenefit	248us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	3,933us-gaap_DepreciationAndAmortization	3,474us-gaap_DepreciationAndAmortization
Accretion of discounts on short-term-investments	57
Stock-based compensation expense	1,220us-gaap_ShareBasedCompensation	810us-gaap_ShareBasedCompensation
Bad debt expense	697us-gaap_ProvisionForDoubtfulAccounts	347us-gaap_ProvisionForDoubtfulAccounts
Inventory obsolescence expense	777us-gaap_InventoryWriteDown	904us-gaap_InventoryWriteDown
Gross loss (profit) from sale of used rental equipment	5	(5,331)
Gain on disposal of property, plant and equipment		(31)us-gaap_GainLossOnDispositionOfAssets
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivable	10,099	(2,243)
Inventories	(3,953)us-gaap_IncreaseDecreaseInInventories	13,717us-gaap_IncreaseDecreaseInInventories
Costs and estimated earnings in excess of billings		9,266
Prepaid expenses and other current assets	(2,671)	(4,157)
Prepaid income taxes	452us-gaap_IncreaseDecreaseInPrepaidTaxes	(2,031)us-gaap_IncreaseDecreaseInPrepaidTaxes
Accounts payable trade	794	(1,086)
Accrued expenses and other	(6,766)	(2,146)
Deferred revenue	(163)	4,496
Income taxes payable	257	12,321
Net cash provided by (used in) operating activities	(1,409)	52,734
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,147)	(1,382)
Investment in rental equipment	(29)	(17,717)
Proceeds from sale of used rental equipment	244	8,092
Purchase of short-term investments	(1,550)
Proceeds from the sale of short-term investments	1,715
Net cash used in investing activities	(767)	(11,007)
Cash flows from financing activities:
Net payments under line of credit		(931)
Excess tax (expense) benefit from share-based compensation	(1,051)	661
Proceeds from exercise of stock options		212
Net cash used in financing activities	(1,051)	(58)
Effect of exchange rate changes on cash	160	(2)
Increase (decrease) in cash and cash equivalents	(3,067)	41,667
Cash and cash equivalents, beginning of period	33,357	2,726
Cash and cash equivalents, end of period	$ 30,290	$ 44,393

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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