Fair Value Measurements	6 Months Ended
Fair Value Measurements	Mar. 31, 2013
Fair Value Measurements
Fair Value Measurements	10. Fair Value Measurements Derivative Instruments. In fiscal 2009, we entered into an intercompany promissory note with a wholly-owned Canadian subsidiary in connection with the acquisition of Wardrop Engineering, Inc. The intercompany note receivable is denominated in Canadian dollars (“CAD”) and has a fixed rate of interest payable in CAD. In the second quarter of fiscal 2010, we entered into a forward contract for CAD $4.2 million (equivalent to U.S. $3.9 million at the date of inception) that matured on January 28, 2013. In the third quarter of fiscal 2011, we entered into a forward contract for CAD $4.2 million (equivalent to U.S. $4.2 million at the date of inception) with a maturity date of January 27, 2014. Our objective was to eliminate variability of our cash flows on the amount of interest income we receive on the promissory note from changes in foreign currency exchange rates. These contracts were designated as cash flow hedges. Accordingly, changes in the fair value of the contracts were recorded in “Other comprehensive income”. In the second quarter of fiscal 2013, we settled one of the foreign currency forward contracts for U.S. $3.9 million and terminated the remaining forward contract. As a result, we recognized an immaterial gain in our condensed consolidated statements of income for the period. Debt. The fair value of long-term debt was determined using the present value of future cash flows based on the borrowing rates currently available for debt with similar terms and maturities (Level 2 measurement, as described in “Critical Accounting Policies and Estimates” in our Annual Report on Form 10-K for the fiscal year ended September 30, 2012). The carrying value of our long-term debt approximates fair value at March 31, 2013 and September 30, 2012. For the first six months of fiscal 2013, we had a net borrowing of $182.4 million under our credit agreement to fund our business acquisitions, working capital needs and contingent earn-outs.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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