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Summary Of Significant Accounting Policies (Narratives) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Significant Accounting Policies [Line Items] |  |  |
Options excluded from computation of diluted earning per share | 372,653 | 569,363 | 605,186
Stock options outstanding range of exercise prices, lower limit | $ 32.55 | $ 32.55 | $ 35.69
Stock options outstanding range of exercise prices, upper limit | $ 54.88 | $ 54.88 | $ 54.88
Options expiration period | 2014 |  |
Accumulated other comprehensive loss | $ (19,191,000) | $ (14,793,000) |
Accumulated other comprehensive loss, pension net actuarial loss | (24,500,000) | (20,100,000) |
Accumulated other comprehensive loss, currency translation adjustment | 5,300,000 | 5,600,000 |
Accumulated other comprehensive loss, interest rate swaps |  | $ (300,000) |
Restricted Shares [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Options excluded from computation of diluted earning per share | 173,000 | 214,000 | 180,000
Buildings [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life, minimum | 10 |  |
Property, plant and equipment, useful life, maximum | 40 |  |
Machinery And Equipment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life, minimum | 3 |  |
Property, plant and equipment, useful life, maximum | 10 |  |
Office Furniture And Equipment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, useful life, minimum | 3 |  |
Property, plant and equipment, useful life, maximum | 10 |  |
Software Development Costs [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of capitalized software, minimum | 3 |  |
Estimated useful life of capitalized software, maximum | 10 |  |
USG Segment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of segment revenue from software components | 70.00% |  |
Percentage of consolidated revenue from software components | 35.00% |  |
Revenue recognition period based on contract maintenance terms, months | 12 |  |
Percentage of segment revenues recognized on a straight-line basis over the lease term or when products are delivered or services are performed | 30.00% |  |
Percentage of consolidated revenues recognized on a straight-line basis over the lease term or when products are delivered or services are performed | 15.00% |  |
Test [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 40.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 10.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 60.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 15.00% |  |
Percentage of segment revenues for which reliable measure of output cannot be established for recognition | 10.00% |  |
Percentage of consolidated revenues for which reliable measure of output cannot be established for recognition | 2.00% |  |
Filtration [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 65.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 15.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 35.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 10.00% |  |

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