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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

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