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Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Ordinary Shares | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive (Loss) Income | [1] | Retained Earnings
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2013 | $ 3,274,783 | $ 4,199 | $ 2,878,898 | $ (2,785,071) | $ 632 | $ 3,176,125
Beginning balance, Shares at Sep. 30, 2013 |  | 160,062 |  |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 422,122 |  |  |  |  | 422,122
Other comprehensive income (loss) | (10,604) |  |  |  | (10,604) |
Comprehensive income | 411,518 |  |  |  |  |
Employee stock options exercised | 128,136 | $ 73 | 128,063 |  |  |
Employee stock options exercised, Shares |  | 4,395 |  |  |  |
Repurchase of shares | (372,014) |  |  | (372,014) |  |
Repurchase of shares, Shares |  | (8,425) |  |  |  |
Tax benefit from equity-based awards | 3,241 |  | 3,241 |  |  |
Cash dividends declared | (94,418) |  |  |  |  | (94,418)
Issuance of restricted stock, net of forfeitures | 12 | $ 12 |  |  |  |
Issuance of restricted stock, net of forfeitures, Shares |  | 672 |  |  |  |
Equity-based compensation expense related to employees | 44,578 |  | 44,578 |  |  |
Ending balance at Sep. 30, 2014 | 3,395,836 | $ 4,284 | 3,054,780 | (3,157,085) | (9,972) | 3,503,829
Ending balance, Shares at Sep. 30, 2014 |  | 156,704 |  |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | 446,163 |  |  |  |  | 446,163
Other comprehensive income (loss) | (6,781) |  |  |  | (6,781) |
Comprehensive income | 439,382 |  |  |  |  |
Employee stock options exercised | 78,582 | $ 39 | 78,543 |  |  |
Employee stock options exercised, Shares |  | 2,540 |  |  |  |
Repurchase of shares | (454,020) |  |  | (454,020) |  |
Repurchase of shares, Shares |  | (8,596) |  |  |  |
Tax benefit from equity-based awards | 4,690 |  | 4,690 |  |  |
Cash dividends declared | (102,196) |  |  |  |  | (102,196)
Issuance of restricted stock, net of forfeitures | 8 | $ 8 |  |  |  |
Issuance of restricted stock, net of forfeitures, Shares |  | 502 |  |  |  |
Equity-based compensation expense related to employees | 44,560 |  | 44,560 |  |  |
Ending balance at Sep. 30, 2015 | $ 3,406,842 | $ 4,331 | 3,182,573 | (3,611,105) | (16,753) | 3,847,796
Ending balance, Shares at Sep. 30, 2015 | 151,150 | 151,150 |  |  |  |
Comprehensive income: |  |  |  |  |  |
Net income | $ 409,331 |  |  |  |  | 409,331
Other comprehensive income (loss) | 22,848 |  |  |  | 22,848 |
Comprehensive income | 432,179 |  |  |  |  |
Employee stock options exercised | $ 89,767 | $ 39 | 89,728 |  |  |
Employee stock options exercised, Shares | 2,694 | 2,694 |  |  |  |
Repurchase of shares | $ (413,422) |  |  | (413,422) |  |
Repurchase of shares, Shares | (7,236) | (7,236) |  |  |  |
Tax benefit from equity-based awards | $ 7,788 |  | 7,788 |  |  |
Cash dividends declared | (112,300) |  |  |  |  | (112,300)
Issuance of restricted stock, net of forfeitures | 7 | $ 7 |  |  |  |
Issuance of restricted stock, net of forfeitures, Shares |  | 526 |  |  |  |
Equity-based compensation expense related to employees | 42,700 |  | 42,700 |  |  |
Ending balance at Sep. 30, 2016 | $ 3,453,561 | $ 4,377 | $ 3,322,789 | $ (4,024,527) | $ 6,095 | $ 4,144,827
Ending balance, Shares at Sep. 30, 2016 | 147,134 | 147,134 |  |  |  |
[1] | As of September 30, 2016, 2015 and 2014, accumulated other comprehensive income (loss) is comprised of unrealized gain (loss) on derivatives, net of tax, of $12,514, $(12,152) and $(5,522), unrealized gain (loss) on short-term interest-bearing investments, net of tax, of $568, $319 and $(39) and unrealized (loss) on defined benefit plan, net of tax, of $(6,987), $(4,920) and $(4,411).

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