Segment Information - Company's Segments Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Net sales:
Net sales	$ 931.6	$ 990.5	$ 1,822.9	$ 1,953.0
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	212.8	222.5	388.0	428.7
Americas [Member]
Net sales:
Net sales	434.1	474.6	837.4	918.3
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	92.2	94.8	150.8	167.1
Asia-Pacific [Member]
Net sales:
Net sales	230.3	245.3	468.5	504.3
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	55.6	56.8	115.7	129.5
Japan [Member]
Net sales:
Net sales	138.0	125.5	269.1	247.3
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	45.2	46.1	89.6	89.8
Europe [Member]
Net sales:
Net sales	110.7	126.1	207.7	232.8
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	18.5	24.0	28.8	39.4
Reportable Geographical Components [Member]
Net sales:
Net sales	913.1	971.5	1,782.7	1,902.7
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	211.5	221.7	384.9	425.8
Other [Member]
Net sales:
Net sales	18.5	19.0	40.2	50.3
Earnings from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest	$ 1.3	$ 0.8	$ 3.1	$ 2.9