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Income Taxes - Reconciliation of Federal Statutory Tax Rate to Company's Effective Tax Rate (Detail)
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]      
Federal statutory tax rate 21.00% 24.50% 35.00%
New U.S. tax legislation (see discussion above) (0.043) 0.546 0
State and local income taxes, net of federal tax benefit 0.10% 0.80% (2.60%)
Effect of foreign and Puerto Rico earnings and foreign tax credits (12.20%) 7.30% (40.80%)
Effect of Research Credits and FDII/Domestic Production Activities (3.30%) (2.80%) (2.70%)
Effect of change in accounting for excess tax benefit relating to share-based compensation (see Note 2) (4.70%) (6.70%) (7.90%)
Effective Income Tax Rate Reconciliation, Disposition of Asset, Percent (2.00%) 1.30% 0.00%
Effective Income Tax Rate Reconciliation, Uncertain Tax Position, Percent 0.00% 3.30% 0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent 0.00% (4.80%) 0.00%
Effective Income Tax Rate Reconciliation, Change in Accounting Method, Percent 0.00% (4.50%) 0.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Percent 0.00% 1.60% 0.00%
Other, net 0.60% (1.10%) 6.30%
Total (4.80%) 73.50% (12.70%)