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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 | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2015
Total current assets | $ 950,516 |  |  | $ 950,516 |  | $ 917,710
Noncurrent deferred income tax assets | 43,934 |  |  | 43,934 |  | 13,105
Total assets | 2,646,066 |  |  | 2,646,066 |  | 2,513,916
Total current liabilities | 451,776 |  |  | 451,776 |  | 338,208
Noncurrent deferred income tax liabilities | 1,081 |  |  | 1,081 |  | 56,414
Total liabilities | 1,487,542 |  |  | 1,487,542 |  | 1,360,812
Total liabilities and stockholders' equity | 2,646,066 |  |  | 2,646,066 |  | 2,513,916
Earnings before income taxes | 63,408 |  | $ 57,559 | 145,730 | $ 172,222 |
Income tax expense | 12,361 |  | 13,806 | 28,039 | 40,830 |
Net earnings | $ 51,047 |  | $ 43,753 | $ 117,691 | $ 131,392 |
Basic earnings per share | $ 0.83 |  | $ 0.68 | $ 1.90 | $ 2.02 |
Diluted earnings per share | $ 0.81 |  | $ 0.66 | $ 1.85 | $ 1.98 |
Basic | 61,341 |  | 64,781 | 62,015 | 65,088 |
Diluted | 63,109 |  | 66,227 | 63,560 | 66,504 |
Net cash provided by operating activities |  |  |  | $ 362,481 | $ 171,490 |
Net cash used in investing activities |  |  |  | (122,881) | (188,379) |
Net cash provided by (used in) financing activities |  |  |  | (200,635) | (1,466) |
Effect of Exchange Rate on Cash and Cash Equivalents |  |  |  | (3,048) | (9,548) |
Net change in cash and cash equivalents |  |  |  | $ 35,917 | (27,903) |
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 |  |  | 171,490 |
Net cash used in investing activities |  | (31,279) |  |  | (188,379) |
Net cash provided by (used in) financing activities |  | (1,379) |  |  | (1,466) |
Effect of Exchange Rate on Cash and Cash Equivalents |  | (2,482) |  |  | (9,548) |
Net change in cash and cash equivalents |  | 2,220 |  |  | (27,903) |
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 |  |  | 4,170 |
Net cash used in investing activities |  | 0 |  |  | 0 |
Net cash provided by (used in) financing activities |  | (248) |  |  | (4,170) |
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 |  |  | 167,320 |
Net cash used in investing activities |  | (31,279) |  |  | (188,379) |
Net cash provided by (used in) financing activities |  | (1,131) |  |  | 2,704 |
Effect of Exchange Rate on Cash and Cash Equivalents |  | (2,482) |  |  | (9,548) |
Net change in cash and cash equivalents |  | $ 2,220 |  |  | $ (27,903) |
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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