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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Operating activities:      
Net income $ 472.7 $ 324.5 $ 579.4
Depreciation and amortization 104.0 104.2 115.2
Stock-based compensation expense 27.2 29.3 29.0
Deferred income taxes 88.6 22.4 10.4
Gain on sale of assets (3.6) (11.8) (3.3)
Debt extinguishment   8.5  
Other non-cash adjustments (0.1) (1.2) 1.1
Changes in operating assets and liabilities:      
Receivables, net (128.3) 266.7 173.2
Unbilled receivables, net 62.8 65.8 (239.8)
Inventories, net 246.7 (246.7) (111.0)
Other current assets 8.1 (17.4) (5.8)
Accounts payable 252.1 (222.5) 12.8
Customer advances 162.6 112.3 (90.2)
Payroll-related obligations 61.2 (32.3) (7.6)
Income taxes payable (156.7) (52.1) 36.2
Other current liabilities 6.4 (37.1) 45.6
Other long-term assets and liabilities 17.9 14.7 23.1
Total changes in operating assets and liabilities 532.8 (148.6) (163.5)
Net cash provided by operating activities 1,221.6 327.3 568.3
Investing activities:      
Additions to property, plant and equipment (104.4) (112.3) (147.6)
Additions to equipment held for rental (10.4) (17.9) (26.6)
Acquisition of business, net of cash acquired (110.6)    
Proceeds from sale of property, plant and equipment 1.2 2.4 3.1
Proceeds from sale of equipment held for rental 16.3 38.8 12.0
Investments in unconsolidated affiliates (41.0) (2.9) 0.5
Other investing activities 3.3 14.3 5.6
Net cash used by investing activities (245.6) (77.6) (153.0)
Financing activities:      
Proceeds from issuance of debt (original maturities greater than three months)   303.9  
Repayments of debt (original maturities greater than three months) (5.2) (300.0)  
Debt issuance costs   (9.6)  
Repurchases of Common Stock (122.1) (51.5) (357.4)
Dividends paid (90.4) (81.8) (75.5)
Proceeds from exercise of stock options 42.8 26.1 11.3
Other financing activities (5.5) (2.6)  
Net cash used by financing activities (180.4) (115.5) (421.6)
Effect of exchange rate changes on cash (2.7) 0.3 0.1
Increase (decrease) in cash and cash equivalents 792.9 134.5 (6.2)
Cash and cash equivalents at beginning of year 582.9 448.4 454.6
Cash and cash equivalents at end of year 1,375.8 582.9 448.4
Supplemental disclosures:      
Cash paid for interest 45.2 55.9 53.6
Cash paid for income taxes 153.9 157.2 $ 117.6
Proceeds from income tax refunds 26.6    
Cash paid for operating lease liabilities 51.4 55.8  
Operating right-of-use assets obtained $ 92.5 $ 23.3