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Summary of Significant Accounting Policies - Shares Used in Computing Basic and Diluted Earnings Per Share (Details) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Denominator (thousands of shares): |  |  |  |
Average common shares outstanding for basic computation | 173,154 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 172,760 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 173,055 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 172,494 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares issuable for stock options and awards | 2,474 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,361 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,660 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2,295 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Average common shares outstanding for diluted computation | 175,628 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 175,121 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 175,715 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 174,789 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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