Pro Forma Adjustments Related To The Purchase (Details) (USD $)	3 Months Ended
Mar. 31, 2012	Jul. 31, 2012
Pro Forma Adjustments Related to the Purchase (Details)
Purchase price	$ 55.5	$ 55.5
Debt balances of acquired entity	1.4
Borrowings under bank line of credit used to fund acquisition cost	38
Interest rate applicable to borrowings at closing	2.1971%
Change in annual interest expense attributable to change in variable interest rate of one eighth of one percent	47,500
Purchase price allocation, intangible assets	3.5	3.5
Acquired intangible assets, useful lives (minimum)	4
Acquired intangible assets, useful lives (maximum)	15
Fair value of acquired assets in excess of book value	4.1
Purchase price allocation, goodwill	34.6	34.3
Transaction costs associated with acquisition	$ 0.5

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Change in annual interest expense attributable to change in variable interest rate of one eighth of one percent

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Interest rate applicable to borrowings under bank line of credit used to fund acquisition cost.

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Amount of cash paid to acquire the entity.

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Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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