Acquisitions and Divestitures - Fiscal 2011 Divestitures (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended	1 Months Ended
Apr. 30, 2011	Apr. 30, 2011	Mar. 31, 2011 Optokon
Noncash or Part Noncash Divestitures [Line Items]
Percentage of ownership interests sold			75.00%
Aggregate proceeds from divestiture (cash and non-cash)			$ 9,950
Book value of net assets sold			9,859
Pre-tax gain on sale		4,148	4,148
Income taxes related to the sale		3,493	3,493
Gain on sale, net of tax	655		655
Cash proceeds from divestiture			5,896
Collateralized note received as non-cash consideration			$ 4,054
Note term			15 years

Aggregate Proceeds from Divestiture of Interest in Consolidated Subsidiaries (including cash and other proceeds)

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- Definition

Divestiture of Interest in Consolidated Subsidiaries, Book Value of Net Assets Sold

+ References

No definition available.

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- Definition

Divestiture of Interest in Consolidated Subsidiaries, Gain (Loss) from Divestiture before Income Tax

+ References

No definition available.

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- Definition

Divestiture of Interest in Consolidated Subsidiaries, Gain (Loss) from Divestiture, Net of Tax

+ References

No definition available.

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- Definition

Divestiture of Interest in Consolidated Subsidiaries, Income Tax

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No definition available.

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- Definition

Divestiture of Interest in Consolidated Subsidiaries, Noncash Consideration, Note Receivable, Term

+ References

No definition available.

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- Definition

Divestiture of Interest in Consolidated Subsidiaries, Percentage of Ownership Interests Divested

+ References

No definition available.

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- Definition

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

+ References

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

-Publisher FASB

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

+ References

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-Glossary Investing Activities

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