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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
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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) |

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