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Recent Accounting Pronouncements (Schedule of New Accounting Pronouncements) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Other current assets $ 37,525       $ 43,500       $ 37,525 $ 43,500  
Total current assets 944,424       917,419       944,424 917,419  
Noncurrent deferred income tax assets 20,194       13,105       20,194 13,105  
Other assets 48,060       43,665       48,060 43,665  
Total assets 2,642,362       2,512,404       2,642,362 2,512,404 $ 2,358,603
Total current liabilities 480,613       338,208       480,613 338,208  
Long-term debt, less current portion 579,244       850,000       579,244 850,000  
Noncurrent deferred income tax liabilities 3,777       56,414       3,777 56,414  
Total liabilities 1,429,767       1,359,300       1,429,767 1,359,300  
Total liabilities and stockholders' equity 2,642,362       2,512,404       2,642,362 2,512,404  
Earnings before income taxes 80,756 $ 63,408 $ 54,366 $ 27,956 68,727 $ 57,559 $ 57,591 $ 57,072 226,486 240,949 227,244
Income tax expense                 45,648 59,497 61,400
Net earnings $ 63,147 $ 51,047 $ 40,824 $ 25,820 $ 50,060 $ 43,753 $ 43,855 $ 43,784 $ 180,838 $ 181,452 $ 165,844
Basic earnings per share $ 1.03 $ 0.83 $ 0.66 $ 0.41 $ 0.79 $ 0.68 $ 0.67 $ 0.67 $ 2.92 $ 2.81 $ 2.50
Diluted earnings per share $ 0.99 $ 0.81 $ 0.65 $ 0.40 $ 0.77 $ 0.66 $ 0.66 $ 0.66 $ 2.85 $ 2.75 $ 2.45
Basic                 61,893 64,684 66,432
Diluted                 63,556 66,056 67,776
Net cash provided by operating activities                 $ 435,379 $ 295,990 $ 273,570
Net cash used in investing activities                 (173,946) (284,083) (205,829)
Net cash provided by (used in) financing activities                 (260,993) (34,006) 3,990
Effect of Exchange Rate on Cash and Cash Equivalents                 (1,552) (10,986) (5,000)
Net change in cash and cash equivalents                 $ (1,112) (33,085) 66,731
Accounting Standards Update 2016-09 [Member]                      
Earnings before income taxes       $ 27,956              
Income tax expense       2,136              
Net earnings       $ 25,820              
Basic earnings per share       $ 0.41              
Diluted earnings per share       $ 0.40              
Basic       63,054              
Diluted       64,452              
Net cash provided by operating activities       $ 37,360           295,990 273,570
Net cash used in investing activities       (31,279)           (284,083) (205,829)
Net cash provided by (used in) financing activities       (1,379)           (34,006) 3,990
Effect of Exchange Rate on Cash and Cash Equivalents       (2,482)           (10,986) (5,000)
Net change in cash and cash equivalents       2,220           (33,085) 66,731
Accounting Standards Update 2016-09 [Member] | Restatement Adjustment [Member]                      
Earnings before income taxes       0              
Income tax expense       (209)              
Net earnings       $ 209              
Basic earnings per share       $ 0.00              
Diluted earnings per share       $ 0.00              
Basic       0              
Diluted       79              
Net cash provided by operating activities       $ 248           8,561 5,487
Net cash used in investing activities       0           0 0
Net cash provided by (used in) financing activities       (248)           (8,561) (5,487)
Effect of Exchange Rate on Cash and Cash Equivalents       0           0 0
Net change in cash and cash equivalents       0           0 0
Accounting Standards Update 2016-09 [Member] | Scenario, Previously Reported [Member]                      
Earnings before income taxes       27,956              
Income tax expense       2,345              
Net earnings       $ 25,611              
Basic earnings per share       $ 0.41              
Diluted earnings per share       $ 0.40              
Basic       63,054              
Diluted       64,373              
Net cash provided by operating activities       $ 37,112           287,429 268,083
Net cash used in investing activities       (31,279)           (284,083) (205,829)
Net cash provided by (used in) financing activities       (1,131)           (25,445) 9,477
Effect of Exchange Rate on Cash and Cash Equivalents       (2,482)           (10,986) (5,000)
Net change in cash and cash equivalents       $ 2,220           (33,085) $ 66,731
Accounting Standards Updates 2015-03, 2015-15 and 2015-17 [Member]                      
Other current assets         $ 43,500         43,500  
Total current assets         917,419         917,419  
Noncurrent deferred income tax assets         13,105         13,105  
Other assets         43,665         43,665  
Total assets         2,512,404         2,512,404  
Total current liabilities         338,208         338,208  
Long-term debt, less current portion         848,488         848,488  
Noncurrent deferred income tax liabilities         56,414         56,414  
Total liabilities         1,359,300         1,359,300  
Total liabilities and stockholders' equity         2,512,404         2,512,404  
Net deferred tax liabilities         43,309         43,309  
Accounting Standards Updates 2015-03, 2015-15 and 2015-17 [Member] | Scenario, Previously Reported [Member]                      
Current deferred income tax assets         29,766         29,766  
Other current assets         43,791         43,791  
Total current assets         947,476         947,476  
Noncurrent deferred income tax assets         9,388         9,388  
Other assets         44,886         44,886  
Total assets         2,539,965         2,539,965  
Current deferred income tax liabilities         14         14  
Total current liabilities         338,222         338,222  
Long-term debt, less current portion         850,000         850,000  
Noncurrent deferred income tax liabilities         82,449         82,449  
Total liabilities         1,386,861         1,386,861  
Total liabilities and stockholders' equity         2,539,965         2,539,965  
Net deferred tax liabilities         43,309         43,309  
Accounting Standards Update 2015-17 [Member] | Restatement Adjustment [Member]                      
Current deferred income tax assets         (29,766)         (29,766)  
Total current assets         (29,766)         (29,766)  
Noncurrent deferred income tax assets         3,717         3,717  
Total assets         (26,049)         (26,049)  
Current deferred income tax liabilities         (14)         (14)  
Total current liabilities         (14)         (14)  
Noncurrent deferred income tax liabilities         (26,035)         (26,035)  
Total liabilities         (26,049)         (26,049)  
Total liabilities and stockholders' equity         (26,049)         (26,049)  
Net deferred tax liabilities         0         0  
Accounting Standards Updates 2015-03 and 2015-15 [Member]                      
Current deferred income tax assets         0         0  
Other current assets         (291)         (291)  
Total current assets         (291)         (291)  
Other assets         (1,221)         (1,221)  
Total assets         (1,512)         (1,512)  
Current deferred income tax liabilities         0         0  
Long-term debt, less current portion         (1,512)         (1,512)  
Total liabilities         (1,512)         (1,512)  
Total liabilities and stockholders' equity         $ (1,512)         $ (1,512)