Segment Information - Company's Segments Information (Detail) (USD $)	3 Months Ended											12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014		Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014		Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013		Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Net sales:
Net sales	$ 1,285,262,000	$ 959,589,000	[1]	$ 992,930,000	$ 1,012,132,000	$ 1,298,284,000	[2]	$ 911,478,000	$ 925,884,000	$ 895,484,000	[3]	$ 4,249,913,000	$ 4,031,130,000	$ 3,794,249,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												1,028,494,000	934,570,000	823,638,000
Americas [Member]
Net sales:
Net sales												2,033,453,000	1,926,864,000	1,839,969,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												435,507,000	374,342,000	345,917,000
Asia-Pacific [Member]
Net sales:
Net sales												1,025,169,000	944,676,000	810,420,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												281,586,000	244,142,000	188,510,000
Japan [Member]
Net sales:
Net sales												554,258,000	578,571,000	639,185,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												195,985,000	215,582,000	204,510,000
Europe [Member]
Net sales:
Net sales												497,287,000	469,784,000	432,167,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												107,806,000	101,153,000	90,955,000
Reportable Geographical Components [Member]
Net sales:
Net sales												4,110,167,000	3,919,895,000	3,721,741,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												1,020,884,000	935,219,000	829,892,000
Other [Member]
Net sales:
Net sales												139,746,000	111,235,000	72,508,000
Earnings (losses) from operations:
Segment Reporting Earnings Losses From Continuing Operations Before Unallocated Corporate Expenses Interest												$ 7,610,000	$ (649,000)	$ (6,254,000)

[1] a On a pre-tax basis, includes a charge of $93,779,000 for the quarter ended October 31, which reduced net earnings per diluted share by $0.47, associated with the redemption of $400,000,000 in aggregate principal amount of the Private Placement Notes prior to their scheduled maturities (see "Note G - Debt").

[2] b On a pre-tax basis, includes charges of $480,211,000 for the quarter ended January 31, related to the adverse arbitration ruling between The Swatch Group Ltd. and the Company (see "Note J - Commitments and Contingencies") and pre-tax income of $7,489,000 associated with foreign currency transaction gains on this expense. This reduced net earnings per diluted share by $2.27 when using weighted-average diluted shares of 129,283,000, which include 1,091,000 of incremental shares based upon the assumed exercise of stock options and unvested restricted stock units.

[3] a On a pre-tax basis, includes charges of $9,379,000 for the quarter ended April 30, which reduced net earnings per diluted share by $0.05, associated with severance related to staffing reductions and subleasing of certain office space for which only a portion of the Company's future rent obligations will be recovered (see "Note J - Commitments and Contingencies").