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Repurchase of Shares	12 Months Ended
Repurchase of Shares	Sep. 30, 2018
Equity [Abstract]
Repurchase of Shares	Note 12 — Repurchase of Shares From time to time, the Company’s Board of Directors can adopt share repurchase plans authorizing the repurchase of the Company’s outstanding ordinary shares. The Company’s Board of Directors adopted a share repurchase plan, on February 2, 2016, which authorized the repurchase of up to $750,000 of the Company’s outstanding ordinary shares with no expiration date. On November 8, 2017, the Company’s Board of Directors adopted another share repurchase plan for the repurchase of up to an additional $800,000 of the Company’s outstanding ordinary shares with no expiration date. In April 2018, the Company completed the repurchase of the remaining authorized amount of ordinary shares under the February 2016 plan and began executing repurchases under the November 2017 plan. In fiscal year 2018, the Company repurchased approximately 6,337 ordinary shares at an average price of $66.14 per share (excluding broker and transaction fees). The November 2017 plan permit the Company to purchase its ordinary shares in open market or privately negotiated transactions at times and prices that it considers appropriate. As of September 30, 2018, the Company had remaining authority to repurchase up to $637,127 of its outstanding ordinary shares under the November 2017 plan.