Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Jan. 31, 2017

Jan. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

	2016 Quarters Ended*
(in millions, except per share amounts)	April 30		July 31		October 31		January 31 a
Net sales	$	891.3	$	931.6	$	949.3	$	1,229.6
Gross profit	545.6		577.1		579.5		788.2
Earnings from operations	134.6		174.9		155.2		256.5
Net earnings	87.5		105.7		95.1		157.8
Net earnings per share:
Basic	$	0.69	$	0.84	$	0.76	$	1.27
Diluted	$	0.69	$	0.84	$	0.76	$	1.26

^a  On a pre-tax basis, includes charges for the quarter ended January 31, 2017 of:

i. $25.4 million, which reduced net earnings per diluted share by $0.13, associated with an impairment charge related to software costs capitalized in connection with the development of a new finished goods inventory management and merchandising information system (see "Note B. Summary of Significant Accounting Policies" and "Note E. Property, Plant and Equipment"); and

ii. $12.6 million, which reduced net earnings per diluted share by $0.06, associated with impairment charges related to financing arrangements with diamond mining and exploration companies (see "Note B. Summary of Significant Accounting Policies" and "Note J. Commitments and Contingencies").

	2015 Quarters Ended*
(in millions, except per share amounts)	April 30		July 31 b		October 31		January 31 c
Net sales	$	962.4	$	990.5	$	938.2	$	1,213.6
Gross profit	569.0		593.0		564.5		764.8
Earnings from operations	170.0		172.8		156.4		260.9
Net earnings	104.9		104.9		91.0		163.2
Net earnings per share:
Basic	$	0.81	$	0.81	$	0.71	$	1.28
Diluted	$	0.81	$	0.81	$	0.70	$	1.28

^b  On a pre-tax basis, includes a charge of $9.6 million for the quarter ended July 31, 2015, which reduced net earnings per diluted share by $0.05, associated with an impairment charge related to a financing arrangement with Koidu Limited (see "Note B. Summary of Significant Accounting Policies" and "Note J. Commitments and Contingencies").

^c  On a pre-tax basis, includes charges for the quarter ended January 31, 2016 of:

i. $28.3 million, which reduced net earnings per diluted share by $0.14, associated with an impairment charge related to a financing arrangement with Koidu Limited (see "Note B. Summary of Significant Accounting Policies" and "Note J. Commitments and Contingencies"); and

ii. $8.8 million, which reduced net earnings per diluted share by $0.04, 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").

* The sum of quarterly amounts may not agree with full year amounts due to rounding.