CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (10,627)us-gaap_NetIncomeLoss	$ 34,992us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred income tax benefit	(2,338)us-gaap_DeferredIncomeTaxExpenseBenefit	(676)us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation	10,096us-gaap_Depreciation	8,662us-gaap_Depreciation
Accretion of discounts on short-term-investments	114
Stock-based compensation	2,327us-gaap_ShareBasedCompensation	1,935us-gaap_ShareBasedCompensation
Bad debt expense	1,018us-gaap_ProvisionForDoubtfulAccounts	644us-gaap_ProvisionForDoubtfulAccounts
Inventory obsolescence expense	1,662us-gaap_InventoryWriteDown	1,717us-gaap_InventoryWriteDown
Gross profit from the sale of used rental equipment	(1,349)	(5,466)
Gain on disposal of property, plant and equipment	(2)us-gaap_GainLossOnDispositionOfAssets	(58)us-gaap_GainLossOnDispositionOfAssets
Excess tax expense from stock-based compensation	(1,065)
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivable	3,559	337
Income tax receivable	(6,287)
Inventories	3,303us-gaap_IncreaseDecreaseInInventories	(3,987)us-gaap_IncreaseDecreaseInInventories
Costs and estimated earnings in excess of billings		12,400
Prepaid expenses and other current assets	4,645	306
Prepaid income taxes	900us-gaap_IncreaseDecreaseInPrepaidTaxes	(950)us-gaap_IncreaseDecreaseInPrepaidTaxes
Accounts payable	(2,064)	(2,496)
Accrued expenses and other	(11,503)	(1,346)
Deferred revenue	(3,197)	5,672
Income taxes payable	255	4,117
Net cash provided by (used in) operating activities	(10,553)	55,803
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,418)	(4,379)
Investment in rental equipment	(1,799)	(18,309)
Proceeds from sale of used rental equipment	3,570	8,551
Purchases of short-term investments	(1,875)
Proceeds from the sale of short-term investments	1,715
Net cash provided by (used in) investing activities	193	(14,137)
Cash flows from financing activities:
Principal payments on debt arrangements		(931)us-gaap_RepaymentsOfLongTermDebt
Excess tax benefit from stock-based compensation		661
Proceeds from exercise of stock options		212
Net cash used in financing activities		(58)
Effect of exchange rate changes on cash	516	6
Increase (decrease) in cash and cash equivalents	(9,844)	41,614
Cash and cash equivalents, beginning of period	33,357	2,726
Cash and cash equivalents, end of period	$ 23,513	$ 44,340

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-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

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.

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

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.

+ References

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