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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 6 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Total current assets $ 892,221     $ 892,221   $ 917,710
Noncurrent deferred income tax assets 38,311     38,311   13,105
Total assets 2,569,416     2,569,416   2,513,916
Total current liabilities 479,250     479,250   338,208
Noncurrent deferred income tax liabilities 936     936   56,414
Total liabilities 1,450,455     1,450,455   1,360,812
Total liabilities and stockholders' equity 2,569,416     2,569,416   2,513,916
Earnings before income taxes 54,366   $ 57,591 82,322 $ 114,663  
Income tax expense 13,542   13,736 15,678 27,024  
Net earnings $ 40,824   $ 43,855 $ 66,644 $ 87,639  
Basic earnings per share $ 0.66   $ 0.67 $ 1.07 $ 1.34  
Diluted earnings per share $ 0.65   $ 0.66 $ 1.05 $ 1.32  
Basic 61,639   65,159 62,351 65,242  
Diluted 63,064   66,540 63,768 66,641  
Net cash provided by operating activities       $ 361,682 $ 123,276  
Net cash used in investing activities       (97,204) (107,057)  
Net cash used in financing activities       (261,289) (38,410)  
Effect of Exchange Rate on Cash and Cash Equivalents       (646) (12,335)  
Net change in cash and cash equivalents       $ 2,543 (34,526)  
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     123,276  
Net cash used in investing activities   (31,279)     (107,057)  
Net cash used in financing activities   (1,379)     (38,410)  
Effect of Exchange Rate on Cash and Cash Equivalents   (2,482)     (12,335)  
Net change in cash and cash equivalents   2,220     (34,526)  
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     736  
Net cash used in investing activities   0     0  
Net cash used in financing activities   (248)     (736)  
Effect of Exchange Rate on Cash and Cash Equivalents   0     0  
Net change in cash and cash equivalents   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     122,540  
Net cash used in investing activities   (31,279)     (107,057)  
Net cash used in financing activities   (1,131)     (37,674)  
Effect of Exchange Rate on Cash and Cash Equivalents   (2,482)     (12,335)  
Net change in cash and cash equivalents   $ 2,220     $ (34,526)  
Accounting Standards Update 2015-17 [Member]            
Current deferred income tax assets           0
Total current assets           917,710
Noncurrent deferred income tax assets           13,105
Total assets           2,513,916
Current deferred income tax liabilities           0
Total current liabilities           338,208
Noncurrent deferred income tax liabilities           56,414
Total liabilities           1,360,812
Total liabilities and stockholders' equity           2,513,916
Net deferred tax liabilities           43,309
Accounting Standards Update 2015-17 [Member] | Restatement Adjustment [Member]            
Current deferred income tax assets           (29,766)
Total current assets           (29,766)
Noncurrent deferred income tax assets           3,717
Total assets           (26,049)
Current deferred income tax liabilities           (14)
Total current liabilities           (14)
Noncurrent deferred income tax liabilities           (26,035)
Total liabilities           (26,049)
Total liabilities and stockholders' equity           (26,049)
Net deferred tax liabilities           0
Accounting Standards Update 2015-17 [Member] | Scenario, Previously Reported [Member]            
Current deferred income tax assets           29,766
Total current assets           947,476
Noncurrent deferred income tax assets           9,388
Total assets           2,539,965
Current deferred income tax liabilities           14
Total current liabilities           338,222
Noncurrent deferred income tax liabilities           82,449
Total liabilities           1,386,861
Total liabilities and stockholders' equity           2,539,965
Net deferred tax liabilities           $ 43,309